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PHP 中文字符串截取无乱码的步骤以及php汉字截取函数_preg_split()

Jun 13, 2016 pm 12:34 PM
array php quot split

PHP 中文字符串截取无乱码的方法以及php汉字截取函数_preg_split()

昨天,在写代码时我遇到了一个中文字符串截取的问题,原本是想直接用substr()来,但这个是在单字节符下用的,对于多字节编码的汉字或是其它语言字符中,这个函数可能就用不上了,而且会容易截出乱码来!


现在就把我的下工作记录和总结给大家分享一下:
问题产生及使用案例网站:天气预报15天查询(http://tqybw.net)

问题时间:2013-10-31


解决思路:把汉字按一个汉字在编码下按其在完整性正则分割成数组,再根据需要取截取长度;


1、实现方法函数


开启mbstring扩展,然后自定义函数:


<?php header('content-Type:text/html:charset=utf-8');
function substr_chinese($str, $start, $length = null) {
return join("",
array_slice(
preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $start, $length)
);
} (PS:^_^不错的php学习交流群:276167802,验证:csl,谢谢!)
//实例
$str = "中国地图全图";
echo substr_utf8($str, 0, 4);
//输出: 中国地图
?>
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2、主要函数功能说明preg_split:
对于初学者来说,大家对 说明 array preg_split ( string $pattern, string $subject [, int $limit [, int $flags]] )
返回一个数组,包含 subject 中沿着与 pattern 匹配的边界所分割的子串。
如果指定了 limit,则最多返回 limit 个子串,如果 limit 是 -1,则意味着没有限制,可以用来继续指定可选参数 flags。
flags 可以是下列标记的任意组合(用按位或运算符 | 组合):
PREG_SPLIT_NO_EMPTY
如果设定了本标记,则 preg_split() 只返回非空的成分。
PREG_SPLIT_DELIM_CAPTURE
如果设定了本标记,定界符模式中的括号表达式也会被捕获并返回。本标记添加于 PHP 4.0.5。
PREG_SPLIT_OFFSET_CAPTURE

如果设定了本标记,如果设定本标记,对每个出现的匹配结果也同时返回其附属的字符串偏移量。注意这改变了返回的数组的值,使其中的每个单元也是一个数组,其中第一项为匹配字符串,第二项为其在 subject 中的偏移量。本标记自 PHP 4.3.0 起可用。


提示
如果不需要正则表达式的功能,可以选择使用更快(也更简单)的替代函数如 explode() 或 str_split()。


3、array_slice说明:
array_slice() 函数在数组中根据条件取出一段值,并返回。


<?php $a=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
print_r(array_slice($a,1,2));
?>
输出:Array ( [0] => Cat [1] => Horse )
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本文讲述了PHP 中文字符串截取无乱码方法,希望本文能给读者带来灵感,帮助读者解决疑问,感谢阅读本文。
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