一个有意思的函数dechex,拿来转换数字和字符
<?php
$array1 = array(0,1,2,3,4,5,6,7,8,9);
$array2 = array('w','q','r','t','g','j','k','z','x','v');
for($i=1;$i<10000;$i++){
$t1 = str_replace($array1,$array2,dechex($i));
$t2 = hexdec(str_replace($array2,$array1,$t1));
//$t1 = dechex($i);
//$t2 = hexdec($t1);
echo $i.'->'.$t1.'----'.$t2."<br />";
}
?>