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add a note User Contributed Notes

ludvig dot ericson at gmail dot com
09-Oct-2006 10:03


When I were making command-line interfacing PHP scripts, the below post wouldn't work. The problem is that php://stdin could only be opened once, so I had this:



<?php

function read_input($maxchars = false) {

    static $fh;

    $fh = (!is_resource($fh)) ? fopen('php://stdin') : $fh;

    if ($maxchars !== false) {

        return fgets($fh, (int)$maxchars);

    } else {

        return fgets($fh);

    }

}

?>



This way, you can do something like <?php $input = read_input(); ?> and it'll be set to exactly one line of what the terminal inputs, since fgets() will return when EOL is reached, and with $maxchars you're able to limit it to something reasonable like 255 or so, still breaking on EOL.

im at yourhouse dot not
04-Oct-2006 05:48


Personally for command line usage, I use the following function.

<?php

function getinput($maxchars){

         $f = fopen("php://stdin","r");

         $input = fread($f, $maxchars);

         $input = trim($input);

         return $input;

}

?>

fkjaekel at yahoo dot com dot br
20-Sep-2006 01:37


The dl_file_resume function mentioned below can be improved by using the mime_content_type function.

http://br.php.net/manual/pt_BR/function.mime-content-type.php



before:

<?php

   $file_extension = strtolower(substr(strrchr($filename,"."),1));

  

   //This will set the Content-Type to the appropriate setting for the file

   switch( $file_extension ) {

       case "exe": $ctype="application/octet-stream"; break;

       case "zip": $ctype="application/zip"; break;

       case "mp3": $ctype="audio/mpeg"; break;

       case "mpg":$ctype="video/mpeg"; break;

       case "avi": $ctype="video/x-msvideo"; break;

       default: $ctype="application/force-download";

   }

    

   //Use the switch-generated Content-Type

   header("Content-Type: $ctype");

?>



after:

<?php

   header("Content-Type: ".mime_content_type($file));

?>

jon at lucidlogic dot com
22-Aug-2006 11:24


For downloading over SSL use the headers:



    header("Cache-Control: store, cache");

    header("Pragma: cache");    



instead of the ones below.

Dhani dot Novan at gmail dot com
03-Apr-2006 06:57


Better version from dl_file_resume

i just compile from past post notes here



Change:

1. Fix Critical BUG : (file exe will corrupt because the size is minus one)

before: header("Content-Length: ".$size2);

after: header("Content-Length: ".$size);



2. closequote filename

before: header("Content-Disposition: attachment; filename=$filename");

after: header("Content-Disposition: attachment; filename=\"$filename\"");



3. read as binary

before: $fp=fopen("$file","r");

after: $fp=fopen("$file","rb");



4. use ob_flush



5. workaround for IE filename bug



<?php

function dl_file_resume($file){



    //First, see if the file exists

    if (!is_file($file)) { die("<b>404 File not found!</b>"); }

    

    //Gather relevent info about file

    $len = filesize($file);

    $filename = basename($file);

    $file_extension = strtolower(substr(strrchr($filename,"."),1));

    

    //This will set the Content-Type to the appropriate setting for the file

    switch( $file_extension ) {

        case "exe": $ctype="application/octet-stream"; break;

        case "zip": $ctype="application/zip"; break;

        case "mp3": $ctype="audio/mpeg"; break;

        case "mpg":$ctype="video/mpeg"; break;

        case "avi": $ctype="video/x-msvideo"; break;

        default: $ctype="application/force-download";

    }

    

    //Begin writing headers

    header("Cache-Control:");

    header("Cache-Control: public");

    

    //Use the switch-generated Content-Type

    header("Content-Type: $ctype");

    if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {

        # workaround for IE filename bug with multiple periods / multiple dots in filename

        # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe

        $iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);

        header("Content-Disposition: attachment; filename=\"$iefilename\"");

    } else {

        header("Content-Disposition: attachment; filename=\"$filename\"");

    }

    header("Accept-Ranges: bytes");

    

    $size=filesize($file);

    //check if http_range is sent by browser (or download manager)

    if(isset($_SERVER['HTTP_RANGE'])) {

        list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);

        //if yes, download missing part

        str_replace($range, "-", $range);

        $size2=$size-1;

        $new_length=$size2-$range;

        header("HTTP/1.1 206 Partial Content");

        header("Content-Length: $new_length");

        header("Content-Range: bytes $range$size2/$size");

    } else {

        $size2=$size-1;

        header("Content-Range: bytes 0-$size2/$size");

        header("Content-Length: ".$size);

    }

    //open the file

    $fp=fopen("$file","rb");

    //seek to start of missing part

    fseek($fp,$range);

    //start buffered download

    while(!feof($fp)){

        //reset time limit for big files

        set_time_limit(0);

        print(fread($fp,1024*8));

        flush();

        ob_flush();

    }

    fclose($fp);

    exit;

}

?>

yellow1912 at yahoo dot com
02-Feb-2006 03:46


I tried to use the download resume script below, but it put extreme load on the server for just 1 download only (the file is around 200MB).



Be carefull when you test the script on your server. I'll fgets, or other functions and see if it works.

junk at gieson dot com
15-Jan-2006 06:40


To force download an mp3 file and/or prevent the mp3 from ending up in the browser's cache. This is very similiar to mindplay's example below.



<?php

@ob_end_clean();

// Only allow mp3 files

$allowedFileType = "mp3";



// Set the filename based on the URL's query string

$theFile = $_REQUEST['theFile'];



// Get info about the file

$f = pathinfo($theFile);



// Check the extension against allowed file types

if(strtolower($f['extension']) != strtolower($allowedFileType)) exit;



// Make sure the file exists

if (!file_exists($theFile)) exit;



// Set headers

header("Pragma: public");

header("Expires: Thu, 19 Nov 1981 08:52:00 GMT");

header("Cache-Control: must-revalidate, post-check=0, pre-check=0");

header("Cache-Control: no-store, no-cache, must-revalidate");

header("Cache-Control: private");

header("Content-Transfer-Encoding: binary");

header("Content-Type: audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3");

// This line causes the browser's "save as" dialog

header( 'Content-Disposition: attachment; filename="'.$f['basename'].'"' );

// Length required for Internet Explorer

header("Content-Length: ".@urldecode(@filesize($theFile)));



// Open file

if (($f = fopen($theFile, 'rb')) === false) exit;



// Push file

while (!feof($f)) {

    echo fread($f, (1*(1024*1024))); 

    flush(); 

    @ob_flush();

}



// Close file

fclose($f); 

exit;



?>

xjust at 3axe dot com
28-Sep-2005 04:06


i fixed the resume download function since there were few bugs in it. here it goes



changes: 

- i added "partial content" header 

- added "bytes" to the first content-range header 

- changed _ENV to _SERVER on HTTP_RANGE



best regards from xjust.



function dl_file_resume($file){



   //First, see if the file exists

   if (!is_file($file)) { die("<b>404 File not found!</b>"); }



   //Gather relevent info about file

   $len = filesize($file);

   $filename = basename($file);

   $file_extension = strtolower(substr(strrchr($filename,"."),1));



   //This will set the Content-Type to the appropriate setting for the file

   switch( $file_extension ) {

     case "exe": $ctype="application/octet-stream"; break;

     case "zip": $ctype="application/zip"; break;

     case "mp3": $ctype="audio/mpeg"; break;

     case "mpg":$ctype="video/mpeg"; break;

     case "avi": $ctype="video/x-msvideo"; break;



     //The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)

     case "php":

     case "htm":

     case "html":

     case "txt": die("<b>Cannot be used for ". $file_extension ." files!</b>"); break;



     default: $ctype="application/force-download";

   }



   //Begin writing headers

//   header("Pragma: public");

//   header("Expires: 0");

   header("Cache-Control:");

   header("Cache-Control: public"); 

//   header("Content-Description: File Transfer");

   

   //Use the switch-generated Content-Type

   header("Content-Type: $ctype");

$filespaces = str_replace("_", " ", $filename);



//if your filename contains underscores, you can replace them with spaces

//   $header='Content-Disposition: attachment; filename='.$filespaces;

   header($header );

//

header("Accept-Ranges: bytes");

//   header("Content-Transfer-Encoding: binary");



  $size=filesize($file);

//check if http_range is sent by browser (or download manager)

    if(isset($_SERVER['HTTP_RANGE'])) {

 list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);

//if yes, download missing part

 str_replace($range, "-", $range);

 $size2=$size-1;

 $new_length=$size2-$range;

 header("HTTP/1.1 206 Partial Content");

 header("Content-Length: $new_length");

 header("Content-Range: bytes $range$size2/$size");

} else {

 $size2=$size-1;

 header("Content-Range: bytes 0-$size2/$size");

 header("Content-Length: ".$size2);

}

//open the file

$fp=fopen("$file","r");

//seek to start of missing part

fseek($fp,$range);

//start buffered download

while(!feof($fp))

{

//reset time limit for big files

set_time_limit(0);

print(fread($fp,1024*8));

 flush();

}

fclose($fp); 

   

   exit;

     

}

adamgamble at gmail dot com
21-Sep-2005 11:00


/*

geoCode($address)

Accepts an address in the form of

999 Geocode Dr. New York, Ny 10108

returns array with lat and lon

*/



function geoCode($address) {



    $gaddress = "http://maps.google.com?q=" . urlencode($address);



    $handle = fopen($gaddress, "r");

    $contents = '';



     while (!feof($handle)) {

         $contents .= fread($handle, 8192);

     }

     fclose($handle);

     ereg('<center lat="([0-9.-]{1,})" lng="([0-9.-]{1,})"/>', $contents, $regs);



     $returnData['lat'] = $regs[1];

     $returnData['lon'] = $regs[2];



     return $returnData;

}



print_r(geoCode("1064 Georgetown ln. Birmingham, Al 35217"));

Richard Dale richard at premiumdata dot n dot e dot t
01-Jul-2005 12:11


If you use any of the above code for downloadinng files, Internet Explorer will change the filename if it has multiple periods in it to something with square brackets.  To work around this, we check to see if the User Agent contains MSIE and rewrite the necessary periods as %2E



<?

# eg. $filename="setup.abc.exe";

if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) { 

    # workaround for IE filename bug with multiple periods / multiple dots in filename

    # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe

    $iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);

    header("Content-Disposition: attachment; filename=$iefilename" );

} else {

    header("Content-Disposition: attachment; filename=$filename");

}

?>

admin at rainer-schuetze dot de
14-Jun-2005 09:25


According: dvsoftware at gmail dot com



Hi all, the sript by dvsoftware is quit handy. But I had a lot of problems to read the dam.. file. Every file. I was using a Windows Platform, maybe that was the mistake.

Annyway, I had to read the file in one session:



<?

:

:



        while(!feof($fp))

        {

                //print (fread($fp,1024*8)); //4096 //1024*8

                print fread($fp,$size);

                flush();

        }

        fclose($fp);

:

:

?>

sheyh[at]nospam[]sheyh[dot]nospam[]com
20-Apr-2005 07:39


Following code which was given as official example can lead to infinite loop. 

In case of running from command line and there is no Internet connection, fopen will fail by script timeout, however after that "!feof($handle)" will never be true. 



The result will be script displaying infinite warnings and taking 10-20% cpu and it will not stop unless killed. 



<?php

$handle = fopen("http://www.example.com/", "r");

$contents = '';

while (!feof($handle)) {

  $contents .= fread($handle, 8192);

}

fclose($handle);

?> 



I belive correct example should be:



<?php

$handle = fopen("http://www.example.com/", "r");

$contents = '';

if($handle)

{

 while (!feof($handle)) {

   $contents .= fread($handle, 8192);

 }

fclose($handle);

}

?>

james at reflexive dot net
20-Apr-2005 02:34


Several of these examples use a Content-Disposition header to force the browser to save a file but then they specify the file name without quotes. This will cause problems for some browsers (Mozilla Fire Fox) if the file name contains a space.  You must put quotes around the name if you want to work reliably for all files in all browsers.

<?php 

header ("Content-Disposition: attachment; filename=$theFileName"); // bad



header ("Content-Disposition: attachment; filename=\"$theFileName\""); // good



?>

planetiss at gmail dot com
08-Apr-2005 08:38


For download the big files (more than 8MB), you must used ob_flush() because the function flush empty the Apache memory and not PHP memory.

And the max size of PHP memory is 8MB, but ob_flush is able to empty the PHP memory.



header('Content-Type: application/force-download'); 

header ("Content-Length: " . filesize($file));

header ("Content-Disposition: attachment; filename=$theFileName");



   $fd = fopen($file, "r");

   while(!feof($fd)) 

  {

       echo fread($fd, 4096);

       ob_flush();

       

   }

mrhappy[at]dotgeek.org
08-Apr-2005 10:02


Just a note for anybody trying to implement a php handled download script -



We spent a long time trying to figure out why our code was eating system resources on large files.. Eventually we managed to trace it to output buffering that was being started on every page via an include.. (It was attempting to buffer the entire 600 Megs or whatever size *before* sending data to the client) if you have this problem you may want to check that first and either not start buffering or close that in the usual way :)



Hope that prevents somebody spending hours trying to fix an obscure issue.



Regards :)

james at reflexive dot net
18-Mar-2005 02:22


You will probably want to call unpack() if you are trying to read binary data out of a file and you want to interpret the data you read (rather than just passing it through to a browser). For example, if you were reading the header if a binary file format such as a BMP image file you would need to read 4 byte integers out of the binary file.  fread() will return the binary data in a string.  unpack() will let you extract data out of the string an use it as a number.  

<?php

function Read32BitLittleEndianIntFromBinaryFile($FileHandle)

{

    $BinaryData = fread($FileHandle, 4);

    $UnpackedData = unpack("V", $BinaryData);

    return $UnpackedData[1];

}

?>

dvsoftware at gmail dot com
14-Mar-2005 04:22


I was trying to implement resume support in download script, and i have finnaly succeded. here is the script:



<?php

function dl_file_resume($file){



   //First, see if the file exists

   if (!is_file($file)) { die("<b>404 File not found!</b>"); }



   //Gather relevent info about file

   $len = filesize($file);

   $filename = basename($file);

   $file_extension = strtolower(substr(strrchr($filename,"."),1));



   //This will set the Content-Type to the appropriate setting for the file

   switch( $file_extension ) {

     case "exe": $ctype="application/octet-stream"; break;

     case "zip": $ctype="application/zip"; break;

     case "mp3": $ctype="audio/mpeg"; break;

     case "mpg":$ctype="video/mpeg"; break;

     case "avi": $ctype="video/x-msvideo"; break;



     //The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)

     case "php":

     case "htm":

     case "html":

     case "txt": die("<b>Cannot be used for ". $file_extension ." files!</b>"); break;



     default: $ctype="application/force-download";

   }



   //Begin writing headers

   header("Pragma: public");

   header("Expires: 0");

   header("Cache-Control:");

   header("Cache-Control: public"); 

   header("Content-Description: File Transfer");

   

   //Use the switch-generated Content-Type

   header("Content-Type: $ctype");

$filespaces = str_replace("_", " ", $filename);



//if your filename contains underscores, you can replace them with spaces

  $header='Content-Disposition: attachment; filename='.$filespaces.';';

   header($header );

   header("Content-Transfer-Encoding: binary");



  $size=filesize($file);

//check if http_range is sent by browser (or download manager)

   if(isset($_ENV['HTTP_RANGE'])) {

 list($a, $range)=explode("=",$_ENV['HTTP_RANGE']);

//if yes, download missing part

 str_replace($range, "-", $range);

 $size2=$size-1;

 header("Content-Range: $range$size2/$size");

 $new_length=$size2-$range;

 header("Content-Length: $new_length");

/if not, download whole file

} else {

 $size2=$size-1;

 header("Content-Range: bytes 0-$size2/$size");

 header("Content-Length: ".$size2);

}

//open the file

$fp=fopen("$file","r");

//seek to start of missing part

fseek($fp,$range);

//start buffered download

while(!feof($fp))

{

//reset time limit for big files

set_time_limit();

print(fread($fp,1024*8));

 flush();

}

fclose($fp); 

   

   exit;

     

} 

?>



EXAMPLE

<?php

dl_file_resume("somefile.mp3");

?>



please write if you find any errors, i have tested this only with mp3 files, but others should be fine

fenris_wolf0 at yahoo dot com
05-Mar-2005 06:59


To make the effects of the latest PHP version changes of the fread function even more explicit:  the new size limitation of fread -regardless of the filesize one specifies,  in the example below 1024 * 1024- means that if one was  simply reading the contents of a text file from a dynamic URL like so:



<?

  $dp = "http://www.whatever.com/filename.php";

  $buffer = fopen($dp, 'r');

  if (!$buffer) 

    {

      echo("<P>Error: unable to load URL file into $buffer.      Process  aborted.</P>");

      exit();

    }

  $sp = fread($buffer, 1024*1024);

  fclose($buffer);

  highlight_string($sp);

?>



one should from now on use the file_get_contents function, as shown below, to avoid one's text being truncated forcibly.



<?

  $dp = "http://www.whatever.com/filename.php";

  if (!$dp) 

    {

      echo("<P>Error: unable to load URL file into $dp.  Process aborted.</P>");

      exit();

    }

  $sp = file_get_contents($dp);

  highlight_string($sp);

?>



I thought it couldn't hurt to clarify this detail in order to save time for anyone else who is in the same situation as I was tonight when my ISP abruptly upgraded to the latest version of PHP...    :(



Thank you to every previous contributor to this topic.

m (at) mindplay (dot) dk
16-Jan-2005 04:20


Here's a function for sending a file to the client - it may look more complicated than necessary, but has a number of advantages over simpler file sending functions:



- Works with large files, and uses only an 8KB buffer per transfer. 



- Stops transferring if the client is disconnected (unlike many scripts, that continue to read and buffer the entire file, wasting valuable resources) but does not halt the script 



- Returns TRUE if transfer was completed, or FALSE if the client was disconnected before completing the download - you'll often need this, so you can log downloads correctly. 



- Sends a number of headers, including ones that ensure it's cached for a maximum of 2 hours on any browser/proxy, and "Content-Length" which most people seem to forget. 



(tested on Linux (Apache) and Windows (IIS5/6) under PHP4.3.x)



Note that the folder from which protected files will be pulled, is set as a constant in this function (/protected) ... Now here's the function: 



<?php

function send_file($name) {

  ob_end_clean();

  $path = "protected/".$name;

  if (!is_file($path) or connection_status()!=0) return(FALSE);

  header("Cache-Control: no-store, no-cache, must-revalidate");

  header("Cache-Control: post-check=0, pre-check=0", false);

  header("Pragma: no-cache");

  header("Expires: ".gmdate("D, d M Y H:i:s", mktime(date("H")+2, date("i"), date("s"), date("m"), date("d"), date("Y")))." GMT");

  header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");

  header("Content-Type: application/octet-stream");

  header("Content-Length: ".(string)(filesize($path)));

  header("Content-Disposition: inline; filename=$name");

  header("Content-Transfer-Encoding: binary\n");

  if ($file = fopen($path, 'rb')) {

    while(!feof($file) and (connection_status()==0)) {

      print(fread($file, 1024*8));

      flush();

    }

    fclose($file);

  }

  return((connection_status()==0) and !connection_aborted());

}

?>



And here's an example of using the function: 



<?php 

if (!send_file("platinumdemo.zip")) { 

die ("file transfer failed"); 

// either the file transfer was incomplete 

// or the file was not found 

} else { 

// the download was a success 

// log, or do whatever else 

} 

?> 



Regards, 

Rasmus Schultz

dave at jujuwebdesign dot com
07-Jan-2005 09:07


using the ternary operator as follows seems to be the neatest way of eliminating the 0 length warning (discussed above)...



$content = filesize($file)?fread($handle, filesize($file)):"";

drane
09-Dec-2004 05:53


Somewhere between 4.2.3 and 4.3.9, the behaviour of fread() was changed slightly.



When you ask to fread() 0 bytes of data, it spits out a warning  (IMO for no good reason.  I think reading 0 bytes is perfectly valid, if not very useful.)



Consequently, to write warning-free code using fread, you'd have to take code like this:



$content=fread($fd,filesize($myfile));



and replace it with this:



$content='';

$length=filesize($myfile);

if($length) {

  $content = fread($fd, $length);

}



...or this, depending on your taste:



$length=filesize($myfile);

if($length) {

  $content = fread($fd, $length);

} else {

  $content='';

}



(I'm aware that there are much better ways to read in a whole file at once.  I'm just fixing up someone else's code after a server switch and ran across this stupid warning.)

ibis at connect dot ie
02-Dec-2004 06:23


If, like me, you're in the habit of using fopen("http://...") and fread for pulling fairly large remote files, you may find that the upgrade to PHP5 (5.0.2 on Win2000/IIS5) causes fread to top out at about 8035 bytes. PHP5 RC2 with identical php.ini settings did not exhibit this behaviour (I was using this for testing). Irritating for me because I was using simple_xml_load to load the file contents as XML, and the problem initially appeared to be that function.



Solution - swap over to file_get_contents or use the loop suggested on the documentation above (see Warning).

mightymrj at hotmail dot com
29-Oct-2004 01:37


Problem: mime attachments sending as blank or almost completely blank documents (all data is lost)



Explanation: After a couple days of trying to mime pdf attachments without losing all data, I finally came across this function in some obsolete obscure post: 



set_magic_quotes_runtime()



This is set to on by default in the machine, and it causes fread() and/or base64_encode() (both used in most mime examples I've seen) to read or encrypt binary without slashes for special characters.  This causes sent files to process incorrectly, breaking, thus truncating most of the data in the file.  



Fix: pass 0 to this function and it will do a one time turn off while your code executes.



example:

<?php

   set_magic_quotes_runtime(0);

?>



This can also been turned off in the php.ini file, but I'm not sure what uses that setting or what the consequences might be.



info:

   http://us2.php.net/manual/en/function.set-magic-quotes-runtime.php

fpinho at hotpop dot com
14-Oct-2004 05:21


After using the suggested function from Rasmus Schultz : mindplay(at)mindplay(dot)dk, I've just noticed that people trying to download big files with a slow connection would get download stopped after exactly 60seconds -> the max execution time set with php.ini.

I suggest using a bigger buffer (1024x1024), or maybe resetting the time limit within the 'while' cicle with:

   set_time_limit(0);



The cicle would go like this:



   while(!feof($file) and (connection_status()==0)) { 

     print(fread($file, 1024*1024)); 

     set_time_limit(0);

     flush(); 

   } 



Frederico Pinho

aidan at php dot net
01-Jul-2004 07:55


As of PHP 5.0.0 and PHP 4.3.8, fread($stream, 2048) will only grab 1 packet worth of data from the buffer in a TCP/IP or UDP stream.



Note: 2048 is the suggested size to make sure you get all of one packet, any size larger than that will still have the same result

Mark
15-Jun-2004 08:37


Unfortunately, or maybe fortunately, magic_quotes_runtime setting in php.ini affects this call, even if you specify the bytes count, and even if you specify that the file you're reading is binary (via 'rb' when calling fopen.) So be careful, especially if you're using someone else's library that depends on binary read.

webmaster at wildpeaks dot com
14-May-2004 03:32


The following function retrieves a line in a file, regardless of its size, so you won't get an error if the file's size is beyond php's allowed memory limit (the string has to be below however), which is something i was needing for accessing a big log file generated by a webhost. Indexes start at 1 (so $line = 1 means the first line unlike arrays). If the file is small, it would be better to use "file()" however.





<?php


function strpos_count($haystack, $needle, $i = 0) {


    while (strpos($haystack,$needle) !== false) {$haystack = substr($haystack, (strpos($haystack,$needle) + 1)); $i++;}


    return $i;


}


function getLine($file,$line=1){


    $occurence = 0;


    $contents = '';


    $startPos = -1;


    if (!file_exists($file)) return '';


    $fp = @fopen($file, "rb");


    if (!$fp) return '';


    while (!@feof($fp)) {


        $str = @fread($fp, 1024);


        $number_of_occurences = strpos_count($str,"\n");


        if ($number_of_occurences == 0) {if ($start_pos != -1) {$contents .= $str;}}


        else {


            $lastPos = 0;


            for ($i = 0; $i < $number_of_occurences; $i++){


                $pos = strpos($str,"\n", $lastPos);


                $occurence++;


                if ($occurence == $line) {


                    $startPos = $pos;


                    if ($i == $number_of_occurences - 1) {$contents = substr($str, $startPos + 1);}


                } elseif ($occurence == $line + 1) {


                    if ($i == 0) {$contents .= substr($str, 0, $pos);} else {$contents = substr($str, $startPos, $pos - $startPos);}


                    $occurence = 0;


                    break;


                }


                $lastPos = $pos + 1;


            }


        }


    }


    @fclose($fp);


    return $contents;


}


?>

squeegee
13-Apr-2004 08:25


fread also works for fsockopen's that are open-ended (no feof) if you know how the last packet for a particular set of data should end. For example, if you sent a command to an nntp server, the reply from the server would end with a dot and a carriage return/linefeed. The connection still stays open for more commands, but doing it this way is more efficient than doing line-by-line fgets until you get to the end of the reply.



<?php

if(($res=nntp_cmd($conn,"BODY $msgid",222))===false){

    continue;

}else{

    $contents='';

    while(1){

        $packet=fread($conn,8192);

        $contents.=$packet;

        if(substr($packet,-3)==".\r\n")break;

    }

    // do something with $contents

}

?>

Brian
17-May-2003 05:10


Two quick notes on download prompting...


First, the following line:





<?php


header("Cache-Control: no-cache, must-revalidate");


?>





causes IE6 to prompt you to download the script instead of the output and will fail to connect.  Take out that header and everything works perfectly.





Pragma: no-cache doesn't cause a problem.





Second, Mozilla tries to add .php to the download file name if content-type is application. Changing the content type to the more specific MIME type (such as audio/mpeg) fixes that but causes IE to try its plugins (such as Quicktime).





The fix I found for that to specify attachment instead of inline.  Here's my code: a prompted, small buffer MP3 download:





<?php


function downloadMP3 ($fileDir, $fileName) {


   $completeFilePath=$fileDir.'/'.$fileName;


   header('Pragma: no-cache');


   header("Content-type: audio/mpeg\nContent-Disposition: attachment; filename=\"" . $fileName . "\"\nContent-length: ".(string)(filesize($completeFilePath)));


   $fd=fopen($completeFilePath,'rb');


      while(!feof($fd)) {


         print(fread($fd, 4096));


         flush();


      }


}


?>

c97 at c97 dot art dot pl
21-Nov-2002 01:02


Simple script to limit browser download speed using fread function.



<?php



$file = "test.mp3"; // file to be send to the client

$speed = 8.5; // 8,5 kb/s download rate limit



if(file_exists($file) && is_file($file)) {



    header("Cache-control: private");

    header("Content-Type: application/octet-stream"); 

    header("Content-Length: ".filesize($file));

    header("Content-Disposition: filename=$file" . "%20"); 



    flush();



    $fd = fopen($file, "r");

    while(!feof($fd)) {

         echo fread($fd, round($speed*1024));

        flush();

        sleep(1);

    }

    fclose ($fd);



}



?>

rob at lbox.org
14-Nov-2002 05:28


I spent a while trying to get this to work so I thought I'd share.





Here's how to read a remote binary file using fread.





<?php


$fp = fopen("http://www.site.com/img.jpg", "rb");





if($fp){


 while(!feof($fp)) {


     $img = $img . fread($fp, 1024);


 }


}


?>





This will read the contents of the file into the var $img 1024 bytes at a time.  I used that number because it seemed safe, but you can increment it all you want I guess.





I don't know if everyone but me gets this, but I thought I'd share since I didn't see anything like it out there.

mail at scherzbold dot net
08-Jul-2002 09:09


I wrote a simple function for grabbing binary files from the web.





<?php


function wwwcopy($file,$nfile)


{


    $fp = @fopen($file,"rb");


    while(!feof($fp))


    {


        $cont.= fread($fp,1024);


    }


    fclose($fp);





    $fp2 = @fopen($nfile,"w");


    fwrite($fp2,$cont);


    fclose($fp2);


}


?>

sbedbergAT at ucdavisDOT dot edu
10-Jun-2002 11:40


PHP seems to preallocate a buffer of length <length> - so, you may need to increase your memory_limit if you use a large <length>, even though the actual bytecount read is small.

(this is on php 4.1.1/Solaris 8; your mileage may vary).

heikki dot korpela at wapit dot com
26-Aug-2000 05:22


Fread is binary-safe IF AND ONLY IF you don't use magic-quotes. If you do, all null bytes will become \0, and you might get surprising results when unpacking.





That is, you would do something like





<?php


set_magic_quotes_runtime(0);


?>





before fread()





and something like





<?php


set_magic_quotes_runtime(get_magic_quotes_gpc()) after.


?>





And, after fread, an unpack would be needed, of course. Surprisingly, pack(), however, does not work quite like in Perl (or perhaps I'm just missing something here) - you can't pack an array directly, but instead you'll have to pack each element seperately to the string:





<?php


foreach ($data as $dec) {


  $data_output .= pack("C*", $dec);


}


?>

ethanh at pushgroup dot net
15-Jan-2000 10:49


For reading from a specified point in the file, use:





<?php


$fp=fopen("$filename","r");


fseek($fp,$numpoint);


$content=fread($fp,filesize("$filename"));


fclose($fp);


?>





For doing the same with an url-based file, use jeichorn@mail.com's solution and substr it.

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