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  1. <?php
  2.  
  3. $array = array(
  4.   array (
  5.     'id' => '1',
  6.     'a_date' => '2016-04-30',
  7.   ),
  8.   array (
  9.     'id' => '2',
  10.     'a_date' => '2016-05-21',
  11.   ),
  12.   array (
  13.     'id' => '3',
  14.     'b_date' => '2016-05-30',
  15.   ),
  16.   array (
  17.     'id' => '4',
  18.     'b_date' => '2016-04-02',
  19.   ),
  20. );
  21. $sort = array(); 
  22. foreach( $array as $key => $value ) {
  23. 	$sort[ $key ] = ( isset( $value['a_date'] ) ) ? $value[ 'a_date' ] : $value[ 'b_date' ];
  24. } 
  25. array_multisort( $sort, $array );
  26. var_dump( $array );
Success #stdin #stdout 0.03s 52480KB
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array(4) {
  [0]=>
  array(2) {
    ["id"]=>
    string(1) "4"
    ["b_date"]=>
    string(10) "2016-04-02"
  }
  [1]=>
  array(2) {
    ["id"]=>
    string(1) "1"
    ["a_date"]=>
    string(10) "2016-04-30"
  }
  [2]=>
  array(2) {
    ["id"]=>
    string(1) "2"
    ["a_date"]=>
    string(10) "2016-05-21"
  }
  [3]=>
  array(2) {
    ["id"]=>
    string(1) "3"
    ["b_date"]=>
    string(10) "2016-05-30"
  }
}
https://ideone.com/j15tly
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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