获取中英文混合字符串长度

my_mb_strlen.php

<?php
function my_mb_strlen($value) 
{
    // 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;
}

public static function mb_strlen($string)
{
    $n = $tn = $noc = 0;
    $length = strlen($string);
    while($n < strlen($string)) {
        $t = ord($string[$n]);
        if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
            $tn = 1; $n++; $noc += 0.5;
        } elseif(194 <= $t && $t <= 223) {
            $tn = 2; $n += 2; $noc += 1;
        } elseif(224 <= $t && $t <= 239) {
            $tn = 3; $n += 3; $noc += 1;
        } elseif(240 <= $t && $t <= 247) {
            $tn = 4; $n += 4; $noc += 1;
        } elseif(248 <= $t && $t <= 251) {
            $tn = 5; $n += 5; $noc += 1;
        } elseif($t == 252 || $t == 253) {
                $tn = 6; $n += 6; $noc += 1;
        } else {
            $n++;
        }

        if($noc >= $length) {
            break;
        }

    }
    return intval(ceil($noc));
}