get_defined

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william at avianhosting dot com
04-Nov-2006 04:41


In response to sijmen at digitized dot nl and similar questions -- the problem is variable scope. $GLOBALS is used to access variables in the global scope from inside a function -- this is expected behavior, as get_defined_vars(); is supposed to get the -defined- variables -- and by default, variables in the global scope are -not- defined in the function scope. Therefore, if you want the variables from the global scope -- print_r($GLOBALS);.

zabmilenko at hotmail dot com
01-Sep-2006 10:32


A little gotcha to watch out for:



If you turn off RegisterGlobals and related, then use get_defined_vars(), you may see something like the following:



<?php

Array

(

    [GLOBALS] => Array

        (

            [GLOBALS] => Array

 *RECURSION*

            [_POST] => Array()

            [_GET] => Array()

            [_COOKIE] => Array()

            [_FILES] => Array()

        )



    [_POST] => Array()

    [_GET] => Array()

    [_COOKIE] => Array()

    [_FILES] => Array()



)

?>



Notice that $_SERVER isn't there.  It seems that php only loads the superglobal $_SERVER if it is used somewhere.  You could do this:



<?php

print '<pre>' . htmlspecialchars(print_r(get_defined_vars(), true)) . '</pre>';

print '<pre>' . htmlspecialchars(print_r($_SERVER, true)) . '</pre>';

?>



And then $_SERVER will appear in both lists.  I guess it's not really a gotcha, because nothing bad will happen either way, but it's an interesting curiosity nonetheless.

sijmen at digitized dot nl
13-Jul-2004 11:11


I was wondering what the difference was between get_defined_vars() and the array $GLOBALS. If you call get_defined_vars() not from a function, then there is no difference. But, if you call it from inside a function or class, then it will only return the available variables inside that function/class.



- Sijmen Ruwhof

lbowerh at adelphia dot net
05-Jun-2004 11:19


Here is a function which generates a debug report for display or email

using get_defined_vars. Great for getting a detailed snapshot without

relying on user input.



<?php

function generateDebugReport($method,$defined_vars,$email="undefined"){

    // Function to create a debug report to display or email.

    // Usage: generateDebugReport(method,get_defined_vars(),email[optional]);

    // Where method is "browser" or "email".



    // Create an ignore list for keys returned by 'get_defined_vars'.

    // For example, HTTP_POST_VARS, HTTP_GET_VARS and others are 

    // redundant (same as _POST, _GET)

    // Also include vars you want ignored for security reasons - i.e. PHPSESSID.

    $ignorelist=array("HTTP_POST_VARS","HTTP_GET_VARS",

    "HTTP_COOKIE_VARS","HTTP_SERVER_VARS",

    "HTTP_ENV_VARS","HTTP_SESSION_VARS",

    "_ENV","PHPSESSID","SESS_DBUSER",

    "SESS_DBPASS","HTTP_COOKIE");



    $timestamp=date("m/d/y h:m:s");

    $message="Debug report created $timestamp\n";



    // Get the last SQL error for good measure, where $link is the resource identifier

    // for mysql_connect. Comment out or modify for your database or abstraction setup.

    global $link;

    $sql_error=mysql_error($link);

    if($sql_error){

      $message.="\nMysql Messages:\n".mysql_error($link);

    }

    // End MySQL



    // Could use a recursive function here. You get the idea ;-)

    foreach($defined_vars as $key=>$val){

      if(is_array($val) && !in_array($key,$ignorelist) && count($val) > 0){

        $message.="\n$key array (key=value):\n";

        foreach($val as $subkey=>$subval){

          if(!in_array($subkey,$ignorelist) && !is_array($subval)){

            $message.=$subkey." = ".$subval."\n";

          }

          elseif(!in_array($subkey,$ignorelist) && is_array($subval)){

            foreach($subval as $subsubkey=>$subsubval){

              if(!in_array($subsubkey,$ignorelist)){

                $message.=$subsubkey." = ".$subsubval."\n";

              }

            }

          }

        }

      }

      elseif(!is_array($val) && !in_array($key,$ignorelist) && $val){

        $message.="\nVariable ".$key." = ".$val."\n";

      }

    }



    if($method=="browser"){

      echo nl2br($message);

    }

    elseif($method=="email"){

      if($email=="undefined"){

        $email=$_SERVER["SERVER_ADMIN"];

      }



      $mresult=mail($email,"Debug Report for ".$_ENV["HOSTNAME"]."",$message);

      if($mresult==1){

        echo "Debug Report sent successfully.\n";

      }

      else{

        echo "Failed to send Debug Report.\n";      

      }

    }

}

?>

Ruben Barkow(mail-> at web dot de)
06-May-2004 08:32


this does NOT work:

i tried to find out the name of a variable, that was sent to myfunction($in) with this code:

myfunction($in) {

    $e=array_reverse(get_defined_vars());

    echo "possible name for the variable in the function call: '";

    foreach ($e as $n=>$v){

        if ($v===$in) {

            echo $n;

            break;

        }

    }

    echo"'";

}



but:

get_defined_vars() doesent give back the variables outside of a function.

(the code does work in the main programcode)

php - fw2 - net
30-Dec-2003 07:21


biyectivo, above, is incorrect, at least as of PHP-4.3.3 which does indeed show variables from included/required files, as, IMO, it should. Very useful for debugging foreign code.

biyectivo at hotmail dot com
08-Jun-2003 07:16


Thankfully, get_defined_vars() does NOT return variables which are assigned during an include() call. This would be a big security hole. For example:



//---------------------------------------------------------

include("foo.php");

$var1 = "Hi";



$vars = get_defined_vars();

$ks = array_keys($vars);

    

    for ($i=0;$i<sizeof($ks);$i++)

    {

        echo $ks[$i]." --> ".$vars[$ks[$i]]."< br >";

    }

//---------------------------------------------------------



will return all server variables, then



   var1 --> Hi



but will NOT return



   pwd --> MyPassword



even if inside foo.php there is a line stating



$pwd = "MyPassword";

jgettys at gnuvox dot com
23-Feb-2002 11:09


Simple routine to convert a get_defined_vars object to XML.



function obj2xml($v, $indent='') {

  while (list($key, $val) = each($v)) {

    if ($key == '__attr') continue;

    // Check for __attr

    if (is_object($val->__attr)) {

      while (list($key2, $val2) = each($val->__attr)) {

        $attr .= " $key2=\"$val2\"";

      }

    }

    else $attr = '';

    if (is_array($val) || is_object($val)) {

      print("$indent<$key$attr>\n");

      obj2xml($val, $indent.'  ');

      print("$indent</$key>\n");

    }

    else print("$indent<$key$attr>$val</$key>\n");

  }

}



//Example object

$x->name->first = "John";

$x->name->last = "Smith";

$x->arr['Fruit'] = 'Bannana';

$x->arr['Veg'] = 'Carrot';

$y->customer = $x;

$y->customer->__attr->id='176C4';



$z = get_defined_vars();

obj2xml($z['y']);



will output:

<customer id="176C4">

  <name>

    <first>John</first>

    <last>Smith</last>

  </name>

  <arr>

    <Fruit>Bannana</Fruit>

    <Veg>Carrot</Veg>

  </arr>

</customer>

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get_defined_vars

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