Online PHP editor | output for LsI37

@ 2018-10-11T06:34:44Z

<?php
$array = [
    (object)['id' => 8],
    (object)['id' => 7],
    (object)['id' => 5]
];

$order = [5, 8, 1];

$order = array_flip($order);
$order[''] = max(array_column($array, 'id')) + 1;

usort($array, function($a, $b) use ($order) {
    return ($order[$a->id] ?? $order['']) <=> ($order[$b->id] ?? $order['']);
});
var_export($array);

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: array ( 0 => (object) array( 'id' => 5, ), 1 => (object) array( 'id' => 8, ), 2 => (object) array( 'id' => 7, ), )
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33: array ( 0 => stdClass::__set_state(array( 'id' => 5, )), 1 => stdClass::__set_state(array( 'id' => 8, )), 2 => stdClass::__set_state(array( 'id' => 7, )), )
Output for 5.6.38: Parse error: syntax error, unexpected '?' in /in/LsI37 on line 14
Process exited with code 255.

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