How to intercept Chinese and English strings encoded by utf8 or gbk by php

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Weibo's speech has a word limit, which is counted as two in Chinese, one in English, two in full-width characters and one in half-width characters.

The number of bytes returned with strlen in php is 3 when it is returned in Chinese encoded by utf8, which does not meet the demand.

Mb_strlen can calculate the length according to the character set. For example, utf8 has a Chinese count of 1, but this does not meet the Weibo word limit. Chinese must be calculated as 2.

Google, found a discuz to intercept a variety of encoded characters of the class, under the transformation, has been tested. The parameter $charset only supports gbk and utf-8.

The copy code is as follows:

$a = "Hello @ Hello"; var_dump (strlen_weibo ($a memory utf Mel 8')

The result is 8, where the letter s count is 1, the full-width @ count is 2, the half-width @ count is 1, and the two Chinese counts are 4. The source code is as follows

The copy code is as follows:

Function strlen_weibo ($string, $charset='utf-8') {$n = $count = 0; $length = strlen ($string); if (strtolower ($charset) = = 'utf-8') {while ($n < $length) {$currentByte = ord ($string [$n]); if ($currentByte = = 9 | $currentByte = = 10 | | (32)