A script to imitate sendmail (to capture mails to be saved locally) for PHP using PHP

mailtodisk.php

<?php
// To use this script, set
// sendmail_path = "/path/to/php /path/to/mailtodisk.php"
// in php.ini

// Set the mail redirect folder path
const MAILTODISK_ROOT = "/opt/mailtodisk/";

// Generate a date/time-based random file name
do {
    $filename = 'mail_' . gmdate('Y-m-d-H-i-s') . '_' . uniqid() . '.txt';
} while(is_file($filename));

// Write the mail from stdin to file
$input = file_get_contents('php://stdin');
file_put_contents(MAILTODISK_ROOT . $filename, $input);