Posted in PHP onFebruary 09, 2015
众所周知,php 自带的 strlen 与 substr 函数没法处理中文字符,于是,我们会用 mb_ 系列函数替代。但是,没有 mbstring 库怎么办?这就需要我们自己写一个来替代了,废话不多说,先上代码:
if ( !function_exists('mb_strlen') ) { function mb_strlen ($text, $encode) { if ($encode=='UTF-8') { return preg_match_all('%(?: [\x09\x0A\x0D\x20-\x7E] # ASCII | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16 )%xs',$text,$out); }else{ return strlen($text); } } } /* from Internet, author unknown */ if (!function_exists('mb_substr')) { function mb_substr($str, $start, $len = '', $encoding="UTF-8"){ $limit = strlen($str); for ($s = 0; $start > 0;--$start) {// found the real start if ($s >= $limit) break; if ($str[$s] <= "\x7F") ++$s; else { ++$s; // skip length while ($str[$s] >= "\x80" && $str[$s] <= "\xBF") ++$s; } } if ($len == '') return substr($str, $s); else for ($e = $s; $len > 0; --$len) {//found the real end if ($e >= $limit) break; if ($str[$e] <= "\x7F") ++$e; else { ++$e;//skip length while ($str[$e] >= "\x80" && $str[$e] <= "\xBF" && $e < $limit) ++$e; } } return substr($str, $s, $e - $s); } }
自己写的php中文截取函数mb_strlen和mb_substr
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