floatval
Here's a very simple function for debugging. It's far from perfect but I find it very handy. It outputs the var value and the var name on a new line. The problem is it'll echo any vars and their name if they share the same value. No big deal when debugging and saves the hassle of writing the HTML and var name when echoing a variable. (ev=echo variable). Using get_defined_vars() inside a function renames the var name to the functions variable so isn't as useful for debugging. Of course, you'll need access to the $GLOBALS array
<?
function ev($variable){
foreach($GLOBALS as $key => $value){
if($variable===$value){
echo '<p>'.$key.' - '.$value.'</p>';
}
}
}
$a=0;
ev($a);
$b=0;
ev($b);
$c=0;
ev($c);
?>
Will output
a - 0
a - 0
b - 0
a - 0
b - 0
c - 0
get_defined_vars
(PHP 4 >= 4.0.4, PHP 5)
get_defined_vars — Restituisce un'array contenente tutte le variabili definite
Descrizione
array get_defined_vars
( void
)
Questa funzione restituisce un'array multidimensionale contenente la lista di tutte le variabili definite, siano esse d'ambiente, variabili del server o definite dall'utente, visibili da dove get_defined_vars() viene eseguito.
Valori restituiti
Un'array multidimensionale contenente la lista di tutte le variabili definite.
Esempi
Example #1 Esempio di uso di get_defined_vars()
<?php
$b = array(1, 1, 2, 3, 5, 8);
$arr = get_defined_vars();
// visualizza $b
print_r($arr["b"]);
/* visualizza il percorso dell'interprete PHP (se usato come CGI)
* ad esempio /usr/local/bin/php */
echo $arr["_"];
// visualizza i parametri della linea di comando (se presenti)
print_r($arr["argv"]);
// visualizza tutte le variabili del server
print_r($arr["_SERVER"]);
// visualizza tutte le chiavi disponibili nell'array delle variabili
print_r(array_keys(get_defined_vars()));
?>
Log delle modifiche
| Versione | Descrizione |
|---|---|
| 5.0.0 | La variabile $GLOBALS viene compresa nella matrice restituita. |
add a note
User Contributed Notesget_defined_vars
SyCo
22-Aug-2008 12:52
22-Aug-2008 12:52
kailashbadu at hotmail dot com
03-Mar-2007 12:09
03-Mar-2007 12:09
After a fruitless attempt find a built-in function whic did this, I wrote this functions to find out all the variables (well, those I wanted) in current scope and their values. I believe this is going to be handy in debugging.
<?php
/**
* @desc works out the variables in the current scope(from where function was called).
* Returns an array with variable name as key and vaiable value as value
* @param $varList: variables returned by get_defined_vars() in desired scope.
* $excludeList: variables to be excluded from the list.
* @return array
*/
function getDefinedVars($varList, $excludeList)
{
$temp1 = array_values(array_diff(array_keys($varList), $excludeList));
$temp2 = array();
while (list($key, $value) = each($temp1)) {
global $$value;
$temp2[$value] = $$value;
}
return $temp2;
}
/**
* @desc holds the variable that are to be excluded from the list.
* Add or drop new elements as per your preference.
* @var array
*/
$excludeList = array('GLOBALS', '_FILES', '_COOKIE', '_POST', '_GET', 'excludeList');
//some dummy variables; add your own or include a file.
$firstName = 'kailash';
$lastName = 'Badu';
$test = array('Pratistha', 'sanu', 'fuchhi');
//get all variables defined in current scope
$varList = get_defined_vars();
//Time to call the function
print "<pre>";
print_r(getDefinedVars($varList, $excludeList));
print "</pre>";
?>
william at avianhosting dot com
03-Nov-2006 09:41
03-Nov-2006 09:41
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 04:32
01-Sep-2006 04:32
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 05:11
13-Jul-2004 05:11
I was wondering what the difference was between get_defined_vars() and the array $GLOBALS. If you call get_defined_vars() not from a function, then there is no difference. But, if you call it from inside a function or class, then it will only return the available variables inside that function/class.
- Sijmen Ruwhof
lbowerh at adelphia dot net
05-Jun-2004 05:19
05-Jun-2004 05:19
Here is a function which generates a debug report for display or email
using get_defined_vars. Great for getting a detailed snapshot without
relying on user input.
<?php
function generateDebugReport($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($mresult==1){
echo "Debug Report sent successfully.\n";
}
else{
echo "Failed to send Debug Report.\n";
}
}
}
?>
Ruben Barkow(mail-> at web dot de)
06-May-2004 02:32
06-May-2004 02:32
this does NOT work:
i tried to find out the name of a variable, that was sent to myfunction($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 12:21
30-Dec-2003 12:21
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 01:16
08-Jun-2003 01:16
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
$pwd = "MyPassword";
jgettys at gnuvox dot com
23-Feb-2002 04:09
23-Feb-2002 04:09
Simple routine to convert a get_defined_vars object to XML.
function obj2xml($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>