Home Backend Development PHP Tutorial PHP与MYSQL中UTF8 中文排序示例代码_php技巧

PHP与MYSQL中UTF8 中文排序示例代码_php技巧

May 16, 2016 pm 08:34 PM
utf8

1. 需要在php数组中用中文排序,但是一般使用utf8格式的文件,直接用asort排序不行。用gbk和gb2312可以。这跟几种格式的编码有关系。gbk和gb2312本身的编码就是用拼音排序的。

代码如下

function utf8_array_asort(&$array)
{
if(!isset($array) || !is_array($array))
{
return false;
}
foreach($array as $k=>$v)
{
$array[$k] = iconv('UTF-8', 'GBK//IGNORE',$v);
}
asort($array);
foreach($array as $k=>$v)
{
$array[$k] = iconv('GBK', 'UTF-8//IGNORE', $v);
}
return true;
}

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2. 在MySQL中,我们经常会对一个字段进行排序查询,但进行中文排序和查找的时候,对汉字的排序和查找结果往往都是错误的。 这种情况在MySQL的(www.jb51.net)很多版本中都存在。
如果这个问题不解决,那么MySQL将无法实际处理中文。 出现这个问题的原因是因为MySQL在查询字符串时是大小写不敏感的,在编绎MySQL时一般以ISO-8859字符集作为默认的字符集,因此在比较过程中中文编码字符大小写转换造成了这种现象。
解决方法:
对于包含中文的字段加上"binary"属性,使之作为二进制比较,例如将"name char(10)"改成"name char(10)binary"。
如果你使用源码编译MySQL,可以编译MySQL时使用 --with--charset=gbk 参数,这样MySQL就会直接支持中文查找和排序了(默认的是latin1)。也可以用 extra-charsets=gb2312,gbk 来加入多个字符集。
如果不想对表结构进行修改或者重新编译MySQL,也可以在查询语句的 order by 部分使用 CONVERT 函数。比如

代码如下

复制代码 代码如下:

select * from mytable order by CONVERT(chineseColumnName USING gbk);
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