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@ 2021-09-03T17:56:02Z

<?php

$sql = array(
            array(
                'date_max' => '2019-12-15',
                'id_property' => 18,
                'last_validation' => 1
            ),

            array(
                'date_max' => '2020-08-31',
                'id_property' => 18,
                'last_validation' => 5
            ),

            array(
                'date_max' => '2019-12-15',
                'id_property' => 21,
                'last_validation' => 1
            )
        );
        
$data = [];
//create array of results grouped by the property id
foreach($sql as $current_key => $current_array) {
    $ts = strtotime($current_array['date_max']); //unix timestamp from date
    $data[$current_array['id_property']][$ts]  = $current_array;
}

$maxData = [];
foreach($data as $propertId=>$values) {
    ksort($values); //sort by key, highest value first
    $maxData[] = array_pop($values); //take first value
}

print_r($maxData);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [date_max] => 2020-08-31 [id_property] => 18 [last_validation] => 5 ) [1] => Array ( [date_max] => 2019-12-15 [id_property] => 21 [last_validation] => 1 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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