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php 一维数组排序与多维数组排序

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2016-06-13 11:23:251222browse

php教程 一维数组排序与多维数组排序
 
 先看一维数据排序的实例asort()函数和ksort()函数
 
  
 //asort()函数以数组的值升序为准
 $mix = array("Clalei"=>10,"Bill"=>50,"Aala"=>100);
 asort($mix);
 print_r($mix);
 //ksort()函数以数组的关键字升序为准
 $mix = array("Clalei"=>100,"Bill"=>50,"Aala"=>10);
 ksort($mix);
 print_r($mix);
 
 ?>
 
 一维数据排序二
 
 sort()函数,可将数组按字母或是数字的升序(从低到高)来进行排序:
  
 $name = array("Clalei","Bill","Aala");
 sort($name);
 for($i=0;$i echo $name[$i];
 }
 echo "
";
 $price = array(100,50,10);
 sort($price);
 for($i=0;$i echo $price[$i]." | ";
 }
 
 ?>
 
 好了现在来看看二维数据库教程排序实例代码

 $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);
 
 本例中将把 volume 降序排列,把 edition 升序排列。
 
 现在有了包含有行的数组,但是 array_multisort() 需要一个包含列的数组,因此用以下代码来取得列,然后排序。
 // 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);
 
 数据集合现在排好序了,结果如下:
 volume | edition
 -------+--------
  98 |       2
  86 |       1
  86 |       6
  85 |       6
  67 |       2
  67 |       7

二维数组排序三

array_multisort() 对二维数组进行排序
数组$roughData,我们打算按照accurancy排序。

Array(    [0] => Array        (            [username] => 10yl            [accuracy] => 0.00        )    [1] => Array        (            [username] => 11yl            [accuracy] => 1.00        )    [2] => Array        (            [username] => 12yl            [accuracy] => 0.00        )    [3] => Array        (            [username] => 13yl            [accuracy] => 1.00        ))
方法:
(1)提取accuracy列数组

foreach ($roughData as $key => $row) {
            $usernames[$key] = $row['username'];
            $accuracy[$key] = $row['accuracy'];
}

(2)进行排序
array_multisort($accuracy, SORT_ASC,$roughData);

当print_r($roughData);后我们将得到一个按accuracy升序排序的二维数组


再来看个简单实例用二维数组排序方法

$array[] = array("age"=>20,"name"=>"li");
$array[] = array("age"=>21,"name"=>"ai");
$array[] = array("age"=>20,"name"=>"ci");
$array[] = array("age"=>22,"name"=>"di");
 
foreach ($array as $key=>$value){
 $age[$key] = $value['age'];
 $name[$key] = $value['name'];
}
 
array_multisort($age,SORT_NUMERIC,SORT_DESC,$name,SORT_STRING,SORT_ASC,$array);
print_r($array);
?>


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