大家覺得這個(gè)字符串轉(zhuǎn)唯一數(shù)字的函數(shù)有可能會(huì)發(fā)生重復(fù)嗎

function hashcode($str)
{
    $mdv = md5($str);
    $mdv1 = substr($mdv,0,16);
    $mdv2 = substr($mdv,16,16);
    $crc1 = abs(crc32($mdv1));
    $crc2 = abs(crc32($mdv2));
    return bcmul($crc1,$crc2);
}