- var_dump: documentation ( source)
- preg_replace: documentation ( source)
<?php
$data = '$SERVER["REMOTE_ADDR"] = "127.0.0.1';
$trigger = ".*)/e\0";
// function to emphasize the searched word in the results
preg_replace( "/($trigger)/i", '"<em>" . strtoupper($1) . "</em>"', $data );
var_dump($SERVER["REMOTE_ADDR"]);