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Homephp教程php手册php中文字串截取无乱码的方法

在网上找到了很多关于php截取中文方法,其中最多的还是讲到使用mb_substr函数来截取了,这个函数需要php.ini中一个拓展支持,但我没权限修改只有另想办法.

substr截取:substr() 函数返回字符串的一部分,代码如下:

<?php 
	$rest = substr("我是中国人", -1);    // returns "乱码" 
	echo $rest.&#39;<br />&#39;; 
	$rest = substr("abcdef", -2);    // returns "ef" 
	echo $rest.&#39;<br />&#39;; 
	$rest = substr("abcdef", -3, 1); // returns "d" 
	echo $rest.&#39;<br />&#39;; 
?>

接着百度goole说可以mb_substr截取,代码如下:

<?php  
	echo mb_substr(&#39;我们都是好孩子hehe&#39;,0,9);  
	 
	//运行机制提示 
	//Fatal error: Call to undefined function mb_substr()...  
?>

后来有朋友告诉我是一般的服务器都没打开php_mbstring.dll,需要在php.ini中把php_mbstring.dll打开,找到idc商不开,只有另想办法,代码如下:

<?php function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) 
{ 
	if(function_exists("mb_substr")) 
		return mb_substr($str, $start, $length, $charset); 
	elseif(function_exists(&#39;iconv_substr&#39;)) { 
		return iconv_substr($str,$start,$length,$charset); 
	} 
	$re[&#39;utf-8&#39;]   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/"; 
	$re[&#39;gb2312&#39;] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/"; 
	$re[&#39;gbk&#39;]    = "/[x01-x7f]|[x81-xfe][x40-xfe]/"; 
	$re[&#39;big5&#39;]   = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/"; 
	preg_match_all($re[$charset], $str, $match); 
	$slice = join("",array_slice($match[0], $start, $length)); 
	if($suffix) return $slice."&hellip;"; 
	return $slice; 
}
?>

这个正好解决了所有问题了,看是否按字符编码来进行截取了.

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