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php一维二维数组键排序方法总结

Jun 13, 2016 am 10:04 AM
php exist Summarize sort array method key question

在php中数组排序一直是一个老生常谈的问题,下面我们来集中讲一下关于在php中一维数组与二维数组排序的实现程序,各位同学可参考.


功能:对数组进行重新排序.

说明:冒泡排序 (一维数组)(二维数组某个健排序)

两两比较待排序数据元素的大小,发现两个数据元素的次序相反时即进行交换,直到没有反序的数据元素为止

设想被排序的数组R[1..N] 垂直竖立,将每个数据元素看作有重量的气泡,从下往上扫描数组,凡扫描违反原则的轻气泡,就使其向上”漂浮”.如此反复进行.直到最后任何两个气都是轻者在上,重者在下为止.

 代码如下 复制代码

/**
     * 冒泡排序 (一维数组)(二维数组某个健排序)
     * 两两比较待排序数据元素的大小,发现两个数据元素的次序相反时即进行交换,直到没有反序的数据元素为止
     * 设想被排序的数组R[1..N] 垂直竖立,将每个数据元素看作有重量的气泡,从下往上扫描数组,凡扫描违反原则的轻气泡,就使其向上"漂浮".如此反复进行.
     * 直到最后任何两个气都是轻者在上,重者在下为止.
 */

function bubble_sort($array,$key=null) {
        $count = count($array);
        if($count             return false;
        }
        for($i = 0; $i             for($j = $count - 1; $j > $i; $j--) {
                if($key && isset($array[$key])){//二维数组健存在
                    if($array[$j][$key]                         $tmp = $array[$j];
                        $array[$j] = $array[$j - 1];
                        $array[$j - 1] = $tmp;
                    }
                }else{ //一维数组
                    if($array[$j]                         $tmp = $array[$j];
                        $array[$j] = $array[$j - 1];
                        $array[$j - 1] = $tmp;
                    }
                }
            }
        }
        return $array;
    }


array_multisort排序使用方法


array_multisort() 对二位数组按照指定键值排序的使用方法
本例中定义了一个名为 $data 的二维数组,然后对它进行排序,方法如下

 代码如下 复制代码

$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);
 
// 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);
 
 
print_r($data);


执行后打印结果如下:

Array
(
    [0] => Array
        (
            [volume] => 98
            [edition] => 2
        )
    [1] => Array
        (
            [volume] => 86
            [edition] => 1
        )
    [2] => Array
        (
            [volume] => 86
            [edition] => 6
         
    [3] => Array
        (
            [volume] => 85
            [edition] => 6
        )
    [4] => Array
        (
            [volume] => 67
            [edition] => 2
        )
    [5] => Array
        (
            [volume] => 67
            [edition] => 7
        )
)


一维数组排序我们只要使用sort()就可以了,相对应的 asort($arr); 函数,是按键值排序,且维持原有的键值关系。

同样原理,rsort(); arsort(); krsort(); 函数除了排序是按降序排列外,其它与sort(); rsort(); ksort(); 相同。

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