最准确的php截取字符串长度函数,截取字符串
说是最精确截取长度,其实我也不敢确定是否是最精确的,具体有多精确看下面的效果就知道了:
先上测试用的字符串:
<?php header("Content-Type:text/html;charset=utf-8"); echo cn_substr_utf8('我是一个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('ai\'2145m a ch3我[是一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('【我,是一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('我是一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('我是,一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('我,是,一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('我是asd一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('【我i\'m[是一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('【i\'m a ch我[是一,个,和哈,哦也,,国家!',12); echo '<br />',cn_substr_utf8('【i\'2145m a ch3我[是一,个,和哈,哦也,,国家!',12);
下面是精确截取字符串的效果图:
具体函数代码如下:
//utf-8中文截取,单字节截取模式 function cn_substr_utf8($str,$length,$append='...',$start=0){ if(strlen($str)<$start+1){ return ''; } preg_match_all("/./su",$str,$ar); $str2=''; $tstr=''; //www.phpernote.com for($i=0;isset($ar[0][$i]);$i++){ if(strlen($tstr)<$start){ $tstr.=$ar[0][$i]; }else{ if(strlen($str2)<$length + strlen($ar[0][$i])){ $str2.=$ar[0][$i]; }else{ break; } } } return $str==$str2?$str2:$str2.$append; }
如果大家认为还不够准确大家可以在此基础上进行改进,或者是创新,希望这篇关于php截取字符串长度函数的文章对大家的学习有所帮助。

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