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PHP 二维数组按某列进行排序

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Release: 2016-06-06 19:42:05
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/* * 二维数组 按某列排序 * array_multisort($arr1,$arr2) * 手册 例子如下 * */ $data[] = array(volume = 67, edition = 2);$data[] = array(volume = 86, edition = 1);$data[] = array(volume = 85, edition = 6);$data[] = array(volume = 98, edition

/*
*  二维数组 按某列排序
*  array_multisort($arr1,$arr2)
*  手册 例子如下
*

*/

$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);
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// 取得列的列表
foreach ($data as $key => $row) {
    $volume[$key]  = $row['volume'];
    $edition[$key] = $row['edition'];
}

// 将数据根据 volume 降序排列,根据 edition 升序排列
// 把 $data 作为最后一个参数,以通用键排序
array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
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/*************************************/
/* 从上面的例子不难看出,array_multisort()函数
* 是将每一个二维数组的列作为 一个参数进行排序
*  来达到整个数组的排序
*/
/*************************************/
function sigcol_arrsort($data,$col,$type=SORT_DESC){
    if(is_array($data)){
		$i=0;
	    foreach($data as $k=>$v){
			if(key_exists($col,$v)){
		        $arr[$i] = $v[$col];
				$i++;
			}else{
			    continue;
			}
		}
	}else{
	    return false;
	}
	array_multisort($arr,$type,$data);
	return $data;
}

print_r(sigcol_arrsort($data,'edition',SORT_DESC));
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/*说白了 原理就是:
新数组    原二维数组
 2        array('volume' => 67, 'edition' => 2);
 1        array('volume' => 86, 'edition' => 1);
 6        array('volume' => 85, 'edition' => 6);
 2        array('volume' => 98, 'edition' => 2);
 6        array('volume' => 86, 'edition' => 6);
 7        array('volume' => 67, 'edition' => 7);


这两个数组的每一行都锁在一起,新数组一旦变动顺序,
那么就会连带每一行的二维数组也跟着变换顺序 ,即新数组为参照物
相当于查询子句中的 order by
*/

运行结果:

 7        array('volume' => 67, 'edition' => 7);

6        array('volume' => 86, 'edition' => 6);

6        array('volume' => 85, 'edition' => 6);

2        array('volume' => 98, 'edition' => 2);

2        array('volume' => 67, 'edition' => 2);

1        array('volume' => 86, 'edition' => 1);

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