substr,mb

it2024-07-13 68

substr截取中文字符串会出现乱码，substr是按照单字节截取的，

mb_substr,mb_strcut都可以截取中文字符串，其中mb_substr是按照字符的个数截取（包括中文字符）,mb_strcut是按照字节截取；

$str='水电费22sf223飞说的法士大夫24234是福施福士大夫'; echo mb_strcut($str, 0, 17, 'utf-8').'1 ';//输出:水电费22sf223 echo mb_strcut($str, 3, 17, 'utf-8').'2 ';//输出:电费22sf223飞 echo mb_strcut($str, -3, -2, 'utf-8').'3 ';//输出:空值 echo mb_strcut($str, -3, 2, 'utf-8').'4 ';//输出:空值 echo mb_strcut($str, 3, -2, 'utf-8').'5 ';//输出:电费22sf223飞说的法士大夫24234是福施福士大 $str='水电费22sf223飞说的法士大夫24234是福施福士大夫'; echo mb_substr($str, 0, 17, 'utf-8').' ';//输出:水电费22sf223飞说的法士大夫 echo mb_substr($str, 3, 17, 'utf-8').' ';//输出:费22sf223飞说的法士大夫242 echo mb_substr($str, -3, -2, 'utf-8').' ';//输出:福士 echo mb_substr($str, -3, 2, 'utf-8').' ';//输出:士大 echo mb_substr($str, 3, -2, 'utf-8').' ';//输出:22sf223飞说的法士大夫24234是福施福士 echo " "; $str='234sdh24324shkfsdfsdf'; echo substr($str,0,2).' ';//输出:23 echo substr($str,3,3).' ';//输出:sdh echo substr($str,-7,3).' ';//输出:fsd echo substr($str,-3).' ';//输出:sdf echo substr($str,-3,-6).' ';//输出:空值 echo substr($str,-6,-3).' ';//输出:sdf echo substr($str,3,-2).' ';//输出:sdh24324shkfsdfs

php扩展函数一般比自定义的字符串函数速度快，比如下面这个自定义函数就比php自带的函数慢5到6倍；

$str='水电费22sf223飞说的法士大夫24234是福施福士大夫'; echo cutstr($str, 17, $suffix = ''); function cutstr($string, $length, $suffix = '') { $p = 0; $j = 0; if($string == "") { return ""; } preg_match_all('/([x41-x5a,x61-x7a,x30-x39])/', $string, $letter); //字母 $string_len = strlen($string); $let_len = count($letter[0]); if($string_len == $let_len) { //没有汉字 $len = floor($length / 2); if($string_len > $len) return substr($string, 0, $len) . $suffix; else return substr($string, 0, $len); } $length_tmp = ($string_len - $let_len * 2) + $let_len * 2; if($length_tmp > $length) { for ($k=0;$k<=($length-3);$k++) { $j++; if($j > ($length-3)) { break; } if (ord(substr($string,$k,1)) >= 129) { $k+=2; $j+=2; } else { $p++; } if($p == 2) { $j++; $p = 0; } } $string = substr($string, 0, $k); } $string = str_replace("<BR…"," …",$string); $string = str_replace("<B…"," …",$string); $string = str_replace("<…"," …",$string); if($string_len > strlen($string)) return $string . $suffix; else return $string; }

转载于:https://www.cnblogs.com/anxuexi/archive/2013/04/02/2995232.html

相关资源：php截取字符串函数substr,iconv_substr,mb_substr示例以及优劣分析

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