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Posted by James on 06/02/05 15:09
On 2 Jun 2005 04:40:03 -0700, yehaimanish@gmail.com (manish) wrote:
>Is there any way that the variable name that is passed to the function
>can be displayed.
Someone has wrote some info on how to do this here, as a user
contributed note:
http://uk.php.net/language.variables
I will paste here if you can't find it, credit goes to lucas karisny.
###start paste###
Here's a function to get the name of a given variable. Explanation
and examples below.
<?php
function vname(&$var, $scope=false, $prefix='unique',
$suffix='value')
{
if($scope) $vals = $scope;
else $vals = $GLOBALS;
$old = $var;
$var = $new = $prefix.rand().$suffix;
$vname = FALSE;
foreach($vals as $key => $val) {
if($val === $new) $vname = $key;
}
$var = $old;
return $vname;
}
?>
Explanation:
The problem with figuring out what value is what key in that variables
scope is that several variables might have the same value. To remedy
this, the variable is passed by reference and its value is then
modified to a random value to make sure there will be a unique match.
Then we loop through the scope the variable is contained in and when
there is a match of our modified value, we can grab the correct key.
Examples:
1. Use of a variable contained in the global scope (default):
<?php
$my_global_variable = "My global string.";
echo vname($my_global_variable); // Outputs: my_global_variable
?>
2. Use of a local variable:
<?php
function my_local_func()
{
$my_local_variable = "My local string.";
return vname($my_local_variable, get_defined_vars());
}
echo my_local_func(); // Outputs: my_local_variable
?>
3. Use of an object property:
<?php
class myclass
{
public function __constructor()
{
$this->my_object_property = "My object property string.";
}
}
$obj = new myclass;
echo vname($obj->my_object_property, $obj); // Outputs:
my_object_property
?>
###endpaste###
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