floatval
As a note, get_defined_vars() does not return a set of variable references (as I hoped). For example:
<?php
// define a variable
$my_var = "foo";
// get our list of defined variables
$defined_vars = get_defined_vars();
// now try to change the value through the returned array
$defined_vars["my_var"] = "bar";
echo $my_var, "\n";
?>
will output "foo" (the original value). It'd be nice if get_defined_vars() had an optional argument to make them references, but I imagine its a rather specialized request. You can do it yourself (less conveniently) with something like:
<?php
$defined_vars = array();
$var_names = array_keys(get_defined_vars());
foreach ($var_names as $var_name)
{
$defined_vars[$var_name] =& $$var_name;
}
?>
get_defined_vars
(PHP 4 >= 4.0.4, PHP 5)
get_defined_vars — Retorna o array com todas variáveis definidas
Descrição
array get_defined_vars
( void
)
Essa função retorna um array multimensional contendo uma lista de todas as variáveis definidas, incluindo variáveis de ambiente, servidor ou variáveis definidas pelo usuário, dentro do escopo que get_defined_vars() é chamada.
Valor Retornado
Um array multidimensional com todas as variáveis.
Exemplos
Exemplo #1 Exemplo da get_defined_vars()
<?php
$b = array(1,1,2,3,5,8);
$arr = get_defined_vars();
// mostra $b
print_r($arr["b"]);
/* mostra o caminho do interpretador do PHP (se for usado como CGI)
* por exemplo /usr/local/bin/php */
echo $arr["_"];
// mostra os parâmetros da linha de comando se for usado
print_r($arr["argv"]);
// mostra todas variáveis de servidor
print_r($arr["_SERVER"]);
// mostra todos os indíces possíveis para a matriz de variáveis
print_r(array_keys(get_defined_vars()));
?>
Veja Também
- isset() - Informa se a variável foi iniciada
- get_defined_functions() - Retorna um array de todas as funções definidas
- get_defined_constants() - Retorna uma matriz associativa com os nomes de todas as constantes e seus valores
User Contributed Notes
get_defined_vars
get_defined_vars
donovan at example dot com
21-Oct-2008 02:15
21-Oct-2008 02:15
SyCo
21-Aug-2008 07:52
21-Aug-2008 07:52
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
kailashbadu at hotmail dot com
03-Mar-2007 08:09
03-Mar-2007 08:09
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>";
?>
zabmilenko at hotmail dot com
31-Aug-2006 11:32
31-Aug-2006 11:32
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 $_SERVER will appear in both lists. I guess it's not really a gotcha, because nothing bad will happen either way, but it's an interesting curiosity nonetheless.
lbowerh at adelphia dot net
05-Jun-2004 12:19
05-Jun-2004 12:19
Here is a function which generates a debug report for display or email
using get_defined_vars. Great for getting a detailed snapshot without
relying on user input.
<?php
function generateDebugReport($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($mresult==1){
echo "Debug Report sent successfully.\n";
}
else{
echo "Failed to send Debug Report.\n";
}
}
}
?>
jgettys at gnuvox dot com
23-Feb-2002 12:09
23-Feb-2002 12:09
Simple routine to convert a get_defined_vars object to XML.
<?php
function obj2xml($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>