Beware that this function uses the output buffering mechanism.
If you give a 'stream wrapped' path as argument, anything echoed by the stream wrapper during this call (e.g. trace messages) won't be displayed to the screen but will be inserted in php_strip_whitespace's result.
If you execute this stripped code later, it will display the messages which should have been output during php_strip_whitespace's execution !
php_strip_whitespace
说明
string php_strip_whitespace ( string filename )Returns the PHP source code in filename with PHP comments and whitespace removed. This may be useful for determining the amount of actual code in your scripts compared with the amount of comments. This is similar to using php -w from the commandline.
注: This function works as described as of PHP 5.0.1. Before this it would only return an empty string. For more information on this bug and its prior behavior, see bug report #29606.
范例
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User Contributed Notes
flconseil at yahoo dot fr
08-Jul-2006 11:57
08-Jul-2006 11:57
mwwaygoo AT hotmail DOT com
28-Apr-2006 12:17
28-Apr-2006 12:17
I thought this was a nice function until I realised it wouldnt strip down html. As i'd been reading an article on compressing output to speed up delivery.
So I wrote a little one to do that for me. Here its is, incase people were looking for a html version. It may need tweaking, like with existing 's.
<?php
function strip_html($data)
{
// strip unecessary comments and characters from a webpages text
// all line comments, multi-line comments \\r \\n \\t multi-spaces that make a script readable.
// it also safeguards enquoted values and values within textareas, as these are required
$data=preg_replace_callback("/>[^<]*<\\/textarea/i", "harden_characters", $data);
$data=preg_replace_callback("/\\"[^"<>]+\\"/", "harden_characters", $data);
$data=preg_replace("/(//.*n)/","",$data); // remove single line comments, like this, from // to \\n
$data=preg_replace("/(t|r|n)/","",$data); // remove new lines \\n, tabs and \\r
$data=preg_replace("/(/*.**/)/","",$data); // remove multi-line comments /* */
$data=preg_replace("/(<![^>]*>)/","",$data); // remove multi-line comments <!-- -->
$data=preg_replace('/(\\s+)/', ' ',$data); // replace multi spaces with singles
$data=preg_replace('/>\\s</', '><',$data);
$data=preg_replace_callback("/"[^\\"<>]+"/", "unharden_characters", $data);
$data=preg_replace_callback("/>[^<]*<\\/textarea/", "unharden_characters", $data);
return $data;
}
function harden_characters($array)
{
$safe=$array[0];
$safe=preg_replace('/\\n/', "%0A", $safe);
$safe=preg_replace('/\\t/', "%09", $safe);
$safe=preg_replace('/\\s/', " ", $safe);
return $safe;
}
function unharden_characters($array)
{
$safe=$array[0];
$safe=preg_replace('/%0A/', "\\n", $safe);
$safe=preg_replace('/%09/', "\\t", $safe);
$safe=preg_replace('/ /', " ", $safe);
return $safe;
}
?>
The article code was similar to this, which shouldn't work as php_strip_whitespace takes a filename as input:-
<?php
// ob_start(); and output here
$data=ob_get_contents();
ob_end_clean();
if(strstr($_SERVER['HTTP_ACCEPT_ENCODING'],'gzip'))
{
$data=gzencode(php_strip_whitespace($data),9);
header('Content-Encoding: gzip');
}
echo $data;
?>
dnc at seznam dot cz
22-Oct-2005 06:01
22-Oct-2005 06:01
This function can not be used to strip comments outside <?php ... ?>
// this comment will not be removed
<?php
// this comment will be removed
?>
amedee at amedee dot be
09-Jul-2005 08:29
09-Jul-2005 08:29
Not only can this be used for JavaScript files, but also for:
* Java source code
* CSS (Style Sheets)
* Any file with C-style comments.