中文字符截取完美解决方案
by Dofy函数巧妙地运用了正则表达式, 用起来很方便, 就像 substr 的用法一样, 可以正向截取也可反相截取, 思路值得学习 
PLAIN TEXT >> PHP:
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<?php
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function c_substr($string, $from, $length = null){
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}else{
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}
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return $result;
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}
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$str = "zhon华人min共和guo";
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$from = 3;
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$length = 7;
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// 输出: n华人min共
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//还有utf-8的
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/*
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Regarding windix's function to handle UTF-8 strings:
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one can use the "u" modifier on the regular expression so that the pattern string is treated as UTF-8
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(available from PHP 4.1.0 or greater on Unix and from PHP 4.2.3 on win32).
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This way the function works for other encodings too (like Greek for example).
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The modified function would read like this:
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*/
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function utf8_substr($str,$start) {
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$null = "";
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} else {
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}
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}
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?>
