Need codes which doesn't start with number? Here you go :)

codes

<?php
    $time = time();
	
	$codes = array();
	while (count($codes) < 5) {
		$code = $time*$time;
		$code -= rand(0,999999);
		$code = sha1($code);
		if(!is_numeric(substr($code, 0, 1))){
			array_push($codes, $code);
		}
	}
	
	foreach($codes as $code) {
		echo $code . "\n";
	}
?>