php随机打印出固定数量的字符和数字

function genRandomString() {
$length = 10;
$characters = ‘0123456789abcdefghijklmnopqrstuvwxyz’;
$string = ”;
for ($p = 0; $p < $length; $p++) { $string .= $characters[mt_rand(0, strlen($characters)-1)]; } return $string; }

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