- debug_backtrace: documentation ( source)
- str_repeat: documentation ( source)
- array_walk: documentation ( source)
<?php
$array = array ('backtrace', 'print');
array_walk($array, 'walk_callback', str_repeat("\0",4096));
function walk_callback($value, $key, $userdata)
{
if ($value == 'print')
{
print($userdata);
exit("\n\n");
}
elseif ($value == 'backtrace')
{
debug_backtrace();
if ($userdata !== str_repeat("\0",4096))
{
die("won't get here, \$userdata is still clean until we return");
}
}
}