php编程 会员号和密码

会员号12位，前6位为100508，后6位生成不含4的随机数；密码16位数字，生成1000个不重复的。

//会员号不含4
function getRandStr($length) {
$str = '012356789';
$randString = '';
$len = strlen($str)-1;
for($i = 0;$i < $length;$i ++){ $num = mt_rand(0, $len);
$randString .= $str[$num]; }
return $randString ;
}
$chang='100508';
//password
function getpwd($length) {
$str = '0123456789';
$randString = '';
$len = strlen($str)-1;
for($i = 0;$i < $length;$i ++){ $num = mt_rand(0, $len);
$randString .= $str[$num]; }
return $randString ;
}
//会员12位，开头用100508；和数字16位密码输出
for($a=1;$a<=1000;$a++){
echo $chang;
print_r(getRandStr(6));echo '&nbsp;&nbsp';print_r(getpwd(16));
echo "<br />";
}

?>