How can I get all variable names that have been used?

[knnknn]

I want to get a list of all variable names that have been used in the script:

<?php
$foo = 'blue';
$bar = 'red;

echo listofallvariablename();
?>

Should create 'foo', 'bar'

Is there a function like that?

[knnknn]

OK, case closed.

I can fetch all names via $GLOBALS or get_defined_vars()

[coopster]

Bingo. Just be careful when you look at your data if you are running the function from inside a user-defined function. Variable scope may come into play here! Example:

<pre> 
<?php 
function checkVariables() 
{ 
$a = 1; 
print "Within the function:\n"; 
print_r(get_defined_vars()); 
} 
$b = 2; 
checkVariables(); 
print "Outside the function:\n"; 
print_r(get_defined_vars()); 
?> 
</pre>