php比较多维数组中值的大小排序实现代码_PHP教程

function cmp($a, $b){ 
if ($a["vote_num"] == $b["vote_num"]) { 
return 0; 
} 
return ($a["vote_num"] > $b["vote_num"]) ? -1 : 1; 
} 

$arr = Array 
( 
0 => Array 
( 
o_id => 1861, 
o_name => 2, 
o_pic => 'http://g.jb51.net/image.gif' , 
o_detail => 人人, 
vote_num => 1 
), 

1 => Array 
( 
o_id => 1844, 
o_name => 芭比, 
o_pic => 'http://upload.jb51.net/game_image/dfxxz/dfVIP.files/shenxiandao.jpg', 
o_detail => 也是美女呢, 
vote_num => 2 
), 

2 => Array 
( 
o_id => 1843, 
o_name => 程程, 
o_pic => 'http://g.jb51.net./upload_img/2011-06/31554_4d0088da7a61ad9c8c02a530be94d98e.png', 
o_detail => 美女哦, 
vote_num => 3 
) 
); 
uasort($arr, ”cmp“); 
echo ‘< pre style="text-align:left" >'; 
print_r ($arr); 
echo ‘< / pre >'; 
 
返回 
 代码如下:

Array 
( 
[2] => Array 
( 
[o_id] => 1843 
[o_name] => 程程 
[o_pic] => http://g.jb51.net./upload_img/2011-06/31554_4d0088da7a61ad9c8c02a530be94d98e.png 
[o_detail] => 美女哦 
[vote_num] => 3 
) 
[1] => Array 
( 
[o_id] => 1844 
[o_name] => 芭比 
[o_pic] => http://upload.jb51.net/game_image/dfxxz/dfVIP.files/shenxiandao.jpg 
[o_detail] => 也是美女呢 
[vote_num] => 2 
) 
[0] => Array 
( 
[o_id] => 1861 
[o_name] => 2 
[o_pic] => http://g.jb51.net/image.gif 
[o_detail] => 人人 
[vote_num] => 1 
) 
) 


http://www.bkjia.com/PHPjc/326033.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/326033.htmlTechArticle如果值没有重复的情况，可以先用array_flip()来交换键和值，然后krsort()，最后再array_flip()交换回来，就可以比较大小了。如果要截取数组，可...