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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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Release： 2016-06-13 09:33:59
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示例代码，用到了函数substr与iconv_substr,mb_substr

复制代码 代码如下:




截取中文字符串_脚本之家_www.jb51.net


$str='123脚本之家456欢迎大家的光临';
echo substr($str,0,4);
echo '
';
echo iconv_substr($str,0,4,'utf-8');
echo '
';
echo mb_substr($str,0,4,'utf-8');
?>


说明：
以上代码用到了二个函数iconv_substr和mb_substr，均可以在当前字符下进行字符串截取，以达到中文字符截取的不乱码。

应该如何选择呢？

1、iconv库在某些操作系统上可能运行不正确，需要安装GNU扩展库以保证它的正常运行。mb_substr函数的兼容性更好。

2、iconv函数会先将当前字符串转换为相应的编码再进行截取，而mb函数则是直接根据指定的编码进行截取(提供安全的多字节截取)，所以mb函数的截取效率更高。

因此，mb_substr函数进行中文字符串的截取为最合适的选择。

Related labels：
iconv mb substr
source：php.cn
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