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@ 2019-09-04T17:48:04Z

<?php

$a = Array
(
	'0' => Array
	    (
	        'location_id' => 1,
	        'property_id' => 10
	    ),

	'1' => Array
	    (
	        'location_id' => 2,
	        'property_id' => 20
	    ),

	'2' => Array
	    (
	        'location_id' => 3,
	        'property_id' => 10
	    ),

	'3' => Array
	    (
	        'location_id' => 4,
	        'property_id' => 10
	    ),

	'4' => Array
	    (
	        'location_id' => 5,
	        'property_id' => 10
	    ),

	'5' => Array
	    (
	        'location_id' => 6,
	        'property_id' => 20
	    )
);
$r = [];
foreach($a as $v){
	if(isset($r[$v['property_id']])){
		array_push($r[$v['property_id']]['location_id'], $v['location_id']);
	}else{
		$r[$v['property_id']] = [
			'property_id' => $v['property_id'],
			'location_id' => [$v['location_id']]
		];
	}
}
print_r(array_values($r));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [property_id] => 10 [location_id] => Array ( [0] => 1 [1] => 3 [2] => 4 [3] => 5 ) ) [1] => Array ( [property_id] => 20 [location_id] => Array ( [0] => 2 [1] => 6 ) ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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