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@ 2014-05-04T15:50:58Z

<?php
$arr=array( 
    "0"=> array(
        0=> array ( 
            "ID"=> 118,
            "post_date"=> "2014-04-28 07:27:37",
            "post_title"=> "Title 1"
        ),
        1=> array ( 
            "ID"=> 119,
            "post_date"=> "2014-04-29 07:27:37",
            "post_title"=> "title 2"
        )
    ),
    "1"=> array(
        0=> array ( 
            "ID"=> 135,
            "post_date"=> "2014-04-28 06:37:37", 
            "post_title"=> "Title 3"
        ),
        1=> array ( 
            "ID"=> 148,
            "post_date"=> "2014-04-25 07:27:37", 
            "post_title"=> "Title 4"
        )
    ),
    "2"=> array(
        0=> array ( 
            "ID"=> 135,
            "post_date"=> "2014-04-24 06:37:37", 
            "post_title"=> "Title 5"
        ),
        1=> array ( 
            "ID"=> 148,
            "post_date"=> "2014-04-25 09:21:37", 
            "post_title"=> "Title 6"
        )
    )
);
usort($arr, function($a, $b) {
    return $a['ID'] - $b['ID'];
});
print_r($arr);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined array key "ID" in /in/CK0KC on line 41 Warning: Undefined array key "ID" in /in/CK0KC on line 41 Warning: Undefined array key "ID" in /in/CK0KC on line 41 Warning: Undefined array key "ID" in /in/CK0KC on line 41 Array ( [0] => Array ( [0] => Array ( [ID] => 118 [post_date] => 2014-04-28 07:27:37 [post_title] => Title 1 ) [1] => Array ( [ID] => 119 [post_date] => 2014-04-29 07:27:37 [post_title] => title 2 ) ) [1] => Array ( [0] => Array ( [ID] => 135 [post_date] => 2014-04-28 06:37:37 [post_title] => Title 3 ) [1] => Array ( [ID] => 148 [post_date] => 2014-04-25 07:27:37 [post_title] => Title 4 ) ) [2] => Array ( [0] => Array ( [ID] => 135 [post_date] => 2014-04-24 06:37:37 [post_title] => Title 5 ) [1] => Array ( [ID] => 148 [post_date] => 2014-04-25 09:21:37 [post_title] => Title 6 ) ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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