本文实例讲述了利用PHP函数计算中英文字符串长度的方法。分享给大家供大家参考。具体实现方法如下:
一般来说大家知道英文字符占一个字节,而中文字符gbk占两个字符,utf8占三个字符,很多人印象中php计算字符串长度就是strlen()函数,其实不然,它计算的是字节的长度而非字符的长度,那么如何获取一个字符串中字符的长度呢?还有有mb_strlen().
具体代码如下:
代码如下:
echo $str = 'PHP点点通';
echo strlen($str); //3*1+3*3=12
echo mb_strlen($str, 'gb2312'); //3*1+3*2=9
echo mb_strlen($str, 'utf-8'); //6
可恶的是,mb系列的函数并不是PHP核心函数,默认没有开启的,还有一个超简单的方法,通过正则将字符串分解为字符个体,计算字符的个数即为字符串的长度,代码如下:
代码如下:
function _strlen($str)
{
preg_match_all("/./us", $str, $matches);
return count(current($matches));
}
echo _strlen("PHP点点通"); //6
?>
希望本文所述对大家的PHP程序设计有所帮助。

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