ThinkSNS+ 是如何计算字符显示长度的【黑马PHP培训】

ab
哈
?

mb_strlen($str) + strleng($str)) / 2

preg_match_all('/[a-zA-Z0-9_]/', $value, $single);
$single = count($single[0]) / 2;

$double = str_word_count(preg_replace('([a-zA-Z0-9_])', '', $value));

$length = $single + $double;

Validator::extend('display_length', function ($attribute, $value, array $parameters) {
                        if (empty($parameters)) {
                throw new \InvalidArgumentException('Parameters must be passed');
            }

            $min = 0;
            if (count($parameters) === 1) {
                list($max) = $parameters;
            } elseif (count($parameters) >= 2) {
                list($min, $max) = $parameters;
            }

            if (! isset($max) || $max < $min) {
                throw new \InvalidArgumentException('The parameters passed are incorrect');
            }

            // 计算单字节.
            preg_match_all('/[a-zA-Z0-9_]/', $value, $single);
            $single = count($single[0]) / 2;

            // 多子节长度.
            $double = str_word_count(preg_replace('([a-zA-Z0-9_])', '', $value));

                        // 得出最终计算字符的长度
            $length = $single + $double;

            return $length >= $min && $length <= $max;
});

$rules = [
    'inputKey' => 'display_length:5', // 表示 0 - 5 显示长度
    ‘inputkey2’ => 'display_length:4,12' // 表示显示长度为 4 - 12
];