PHP计算密码强度的实例

<?php
function password_strength($str) {
    $score = 0;
    if (preg_match("/[0-9]+/", $str)) {
        $score++;
    }
    if (preg_match("/[0-9]{3,}/", $str)) {
        $score++;
    }
    if (preg_match("/[a-z]+/", $str)) {
        $score++;
    }
    if (preg_match("/[a-z]{3,}/", $str)) {
        $score++;
    }
    if (preg_match("/[A-Z]+/", $str)) {
        $score++;
    }
    if (preg_match("/[A-Z]{3,}/", $str)) {
        $score++;
    }
    if (preg_match("/[_|\-|+|=|*|!|@|#|$|%|^|&|(|)]+/", $str)) {
        $score+= 2;
    }
    if (preg_match("/[_|\-|+|=|*|!|@|#|$|%|^|&|(|)]{3,}/", $str)) {
        $score++;
    }
    if (strlen($str) >= 10) {
        $score++;
    }
    return $score;
}
echo password_strength('admin888');