I'm learning about linux systems, and I've read that '/e' is deprecated, but I'm using a machine with PHP 5.3 and I want to learn how this code could be misused to execute different commands. How can I use this code to execute external commands?
#!/usr/bin/php
<?php
function y($m)
{
$m = preg_replace("/\./", " x ", $m);
$m = preg_replace("/@/", " y", $m);
return $m;
}
function x($y, $z)
{
$a = file_get_contents($y);
$a = preg_replace("/(\[x (.*)\])/e", "y(\"\\2\")", $a);
$a = preg_replace("/\[/", "(", $a);
$a = preg_replace("/\]/", ")", $a);
return $a;
}
$r = x($argv[1], $argv[2]);
print $r;
?>