一、函数说明
substr、mb_substr、mb_strcut这三个函数都用来截取字符串,所不同的是:substr是最简单的截取,无法适应中文;mb_substr是按字来切分字符串,而mb_strcut是按字节来切分字符串,截取中文都不会产生半个字符的现象。
这三个函数的前三个参数完全一致,即:
第一个参数是操作对象
第二个参数是截取的起始位置
第三个参数是截取的数量
mb_substr和mb_strcut还有第四个参数:第四个参数可以根据不同的字符集进行设置
//对待一个UTF8的中文字符是3个长度
//对待一个gbk的中文字符是2个长度
header("content-Type:text/html;charset=utf-8");
//设置内部编码
mb_internal_encoding('UTF-8');
//测试
$cn_str="钓鱼岛是中国的hehe";
$en_str="this is just a test";
//使用substr
echo substr($cn_str,0,3).'
'; //钓
echo substr($en_str,0,3).'
'; //thi
//使用mbsubstr()
echo "mb_substr-3:".mb_substr($cn_str,0,3).'
'; //钓鱼岛 按照字来划分
echo "substr-3:".substr($cn_str,0,3).'
';//钓 按照字节来划分
echo "mb_strcut-3:".mb_strcut($cn_str,0,3).'
'; //钓 按照字节来划分
echo "mb_substr-4:".mb_substr($cn_str,0,4).'
'; //钓鱼岛 按照字来划分
echo "substr-4:".substr($cn_str,0,4).'
'; //钓 按照字节来划分(出现乱码)
echo "mb_strcut-4:".mb_strcut($cn_str,0,4).'
'; //钓 按照字节来划分(不会出现乱码)
echo strlen($cn_str).'
'; //26
echo mb_strlen($cn_str).'
'; //12
echo iconv_strlen($cn_str).'
';//26
?>
三、结论
substr、mb_strcut表现都不够理想,mb_substr可以正常使用,但前提是要安装php扩展库,否则就要自己写一个适应各种情况的截取函数了。

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