random coupon generator in php

<?php
	$passes = array();
 	$chars = "abcdefghkmnopqrstuvwxyz023456789";
	srand((double)microtime()*1000000);
	$amount = 100;
	$lenght = 6;   

	for($j=0; $j<$amount; $j++)
	{

		 $i = 0; $pass = '' ;
		 while ($i <= $length)
		 { $num = rand() % 33; $tmp = substr($chars, $num, 1);
		 $pass = $pass . $tmp; $i++;
		 }
		 $passes[] = $pass;
        }

	foreach($passes as $password)
	{
		echo strtoupper(substr(md5($password),0,15))."<br />";
	} 

?>
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