php 根据数组中的指定键值排序，根据数组中指定键值分组

一、 根据数组中的指定键值排序

1.1 原数组如下：$person = array(

array('id'=>1,'name'=>'fj','weight'=>100,'height'=>180),

array('id'=>2,'name'=>'tom','weight'=>53,'height'=>150),

array('id'=>3,'name'=>'jerry','weight'=>120,'height'=>156),

array('id'=>4,'name'=>'bill','weight'=>110,'height'=>190),

array('id'=>5,'name'=>'linken','weight'=>80,'height'=>200),

array('id'=>6,'name'=>'madana','weight'=>95,'height'=>110),

array('id'=>7,'name'=>'jordan','weight'=>70,'height'=>170)

);

1.2 排序代码

public function test($person){

$newArr = array();

foreach($person as $key=>$v){

$newArr[$key]['weight'] = $v['weight'];

}

array_multisort($newArr,SORT_ASC,$person);//SORT_DESC为降序，SORT_ASC为升序

dump($person);

}

1.3 排序结果

array(7) {
  [0] => array(4) {
    ["id"] => int(2)
    ["name"] => string(3) "tom"
    ["weight"] => int(53)
    ["height"] => int(150)
  }
  [1] => array(4) {
    ["id"] => int(7)
    ["name"] => string(6) "jordan"
    ["weight"] => int(70)
    ["height"] => int(170)
  }
  [2] => array(4) {
    ["id"] => int(5)
    ["name"] => string(6) "linken"
    ["weight"] => int(80)
    ["height"] => int(200)
  }
  [3] => array(4) {
    ["id"] => int(6)
    ["name"] => string(6) "madana"
    ["weight"] => int(95)
    ["height"] => int(110)
  }
  [4] => array(4) {
    ["id"] => int(1)
    ["name"] => string(2) "fj"
    ["weight"] => int(100)
    ["height"] => int(180)
  }
  [5] => array(4) {
    ["id"] => int(4)
    ["name"] => string(4) "bill"
    ["weight"] => int(110)
    ["height"] => int(190)
  }
  [6] => array(4) {
    ["id"] => int(3)
    ["name"] => string(5) "jerry"
    ["weight"] => int(120)
    ["height"] => int(156)
  }
}

0.0290s

二、根据数组中指定键值分组2.1 原数组如下：

$arr = [

[

'initial' => 'A',

'typename' => '陈端'],

[

'initial' => 'F',

'typename' =>'编程'

],

[

'initial' => 'F',

'typename' => '屌丝'

]

];

2.2 分组代码

$result = []; //初始化一个数组

foreach($arr as $k=>$v){

$result[$v['initial']][] = $v; //根据initial 进行数组重新赋值

}

dump($result);//result 就是分组之后的返回值

2.3 分组结果

array(2) {

["A"] => array(1) {

[0] => array(2) {

["initial"] => string(1) "A"

["typename"] => string(6) "陈端"

}

}

["F"] => array(2) {

[0] => array(2) {

["initial"] => string(1) "F"

["typename"] => string(6) "编程"

}

[1] => array(2) {

["initial"] => string(1) "F"

["typename"] => string(6) "屌丝"

}

}

}

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