PHP: Ordenar array por uno de sus miembreos con usort - https://es.stackoverflow.com/q/161586/29967, Php

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<?php
/*PHP: Ordenar array de objetos por uno de sus miembreos con usort - https://es.stackoverflow.com/q/161586/29967*/ 
/*Función*/
function object_sorter($clave,$orden=null) {
    return function ($a, $b) use ($clave,$orden) {
          $result=  ($orden=="DESC") ? strnatcmp($b->$clave, $a->$clave) :  strnatcmp($a->$clave, $b->$clave);
          return $result;
    };
}

/*Objeto original*/

$objDatos = 
        array(
                0 => (object) array(
                                    'Id' => 'e6930148-319f-4b87-bb57-8aae98adfc55',
                                    'State' => 'FINISHED',
                                    'StartDate' => '2019-05-03T08:57:30+02:00',
                                    'EndDate' => '2018-05-03T08:59:17+02:00'      
                                   ),
                1 => (object) array(
                                    'Id' => '4263f6a9-6e49-4aee-bcf6-70e1d2578fc5',
                                    'State' => 'FINISHED',
                                    'StartDate' => '2018-05-03T10:15:39+02:00',
                                    'EndDate' => '2018-05-03T10:15:58+02:00'      
                                   ),
                3 => (object) array(
                                    'Id' => '5263f6a9-6e49-4aee-bcf6-70e1d2578fc5',
                                    'State' => 'FINISHED',
                                    'StartDate' => '2020-05-03T10:15:39+02:00',
                                    'EndDate' => '2018-05-03T10:15:58+02:00'      
                                   ),            
            );

/*Original*/
echo "OBJETO ORIGINAL:".PHP_EOL.PHP_EOL;
print_r($objDatos);

/*Orden por defecto (ASCendente)*/
usort($objDatos, object_sorter('StartDate'));
echo PHP_EOL.PHP_EOL."ORDEN ASCENDENTE:".PHP_EOL.PHP_EOL;
print_r($objDatos);

/*Orden DESCendente (indicándolo en parámetro)*/
usort($objDatos, object_sorter('StartDate','DESC'));
echo PHP_EOL.PHP_EOL."ORDEN DESCENDENTE:".PHP_EOL.PHP_EOL;
print_r($objDatos);

[ + ] Show input
Absolute running time: 0.14 sec, cpu time: 0.06 sec, memory peak: 8 Mb, absolute service time: 0,15 sec

OBJETO ORIGINAL: Array ( [0] => stdClass Object ( [Id] => e6930148-319f-4b87-bb57-8aae98adfc55 [State] => FINISHED [StartDate] => 2019-05-03T08:57:30+02:00 [EndDate] => 2018-05-03T08:59:17+02:00 ) [1] => stdClass Object ( [Id] => 4263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2018-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) [3] => stdClass Object ( [Id] => 5263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2020-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) ) ORDEN ASCENDENTE: Array ( [0] => stdClass Object ( [Id] => 4263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2018-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) [1] => stdClass Object ( [Id] => e6930148-319f-4b87-bb57-8aae98adfc55 [State] => FINISHED [StartDate] => 2019-05-03T08:57:30+02:00 [EndDate] => 2018-05-03T08:59:17+02:00 ) [2] => stdClass Object ( [Id] => 5263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2020-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) ) ORDEN DESCENDENTE: Array ( [0] => stdClass Object ( [Id] => 5263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2020-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) [1] => stdClass Object ( [Id] => e6930148-319f-4b87-bb57-8aae98adfc55 [State] => FINISHED [StartDate] => 2019-05-03T08:57:30+02:00 [EndDate] => 2018-05-03T08:59:17+02:00 ) [2] => stdClass Object ( [Id] => 4263f6a9-6e49-4aee-bcf6-70e1d2578fc5 [State] => FINISHED [StartDate] => 2018-05-03T10:15:39+02:00 [EndDate] => 2018-05-03T10:15:58+02:00 ) )