pseudo rand password

<?php
$a = "eyuioa";
$b = "qwrtpsdfghjklzxcvbnm";
$n = "0123456789";
$I = 0;
$s = "__SALT__";
function rnd($i, $a, $data = false){
	$GLOBALS['I']++;
	$data =  $GLOBALS['s'].$GLOBALS['I'];
	$t = md5($data);
	$t = substr($t, 0, 10);
	$t = hexdec($t)/1099511627775;
	$t = $i + $t*($a - $i);
	$t = round($t);
	return (int)$t;
}
$p = "";

$p .= $a[ rnd(0, strlen($a)-1) ];
$p .= $b[ rnd(0, strlen($b)-1) ];
$p .= $a[ rnd(0, strlen($a)-1) ];
$p .= $b[ rnd(0, strlen($b)-1) ];
$p .= $a[ rnd(0, strlen($a)-1) ];
$p .= $b[ rnd(0, strlen($b)-1) ];

if(rnd(0, 1)){
	$p .= $a[ rnd(0, strlen($a)-1) ];
}else{
	$p = $b[ rnd(0, strlen($b)-1) ].$p;
}
$p.= rnd(0, 9).rnd(0, 9);
echo $p;