- get_defined_vars: documentation ( source)
- print_r: documentation ( source)
- array_diff: documentation ( source)
<?php
// The very top of your php script
$vars = get_defined_vars();
// Now do your stuff
$mystring = null;
// Get all the variables defined in current scope
$vars = array_diff(get_defined_vars(),$vars);
echo '<pre>';
print_r($vars);
echo '</pre>';