PHP 中如何自动计算中文的字数?
PHP 中如何准确核算中文字数?这个是困惑我好久的疑问,PHP 中有许多函数能够核算字符串的长度,比方下面的比如,分别使用了 strlen,mb_strlen,mb_strwidth 这个三个函数去测验核算字符串的长度,看看把中文算成几个字节:
echo strlen("你好ABC") . "";//输出 9
echo mb_strlen("你好ABC", 'UTF-8') . "";// 输出 5
echo mb_strwidth("你好ABC") . "";//输出 7
从上面的测验,咱们能够看出:strlen 把中文字符算成 3 个字节,mb_strlen 不论中文仍是英文,都算 1 个字节,而 mb_strwidth 则把中文算成 2 个字节,所以 mb_strwidth 才是咱们想要的:中文 2 个字节,英文 1 个字节。
相同截取字符串也主张使用 mb_strimwidth,也是依照 中文 2 个字节,英文 1 个字节 方法核算以后的,而且假如字数超越截取的请求,这个函数还能够在最终面主动增加‘…’。
mb_strimwidth($post_excerpt,0,240,'...','utf-8');
留意,最终增加‘utf-8’编码参数,能够防止中文截取乱码的疑问。

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