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@ 2014-08-02T06:13:26Z

<?php

$array = array ('1' => (object)array(
            'id' => 225,
            'user_id' => 1,
            'name' => 'Blue Quilted Leather Jacket by Minusey - $499'

        ),
        '2' => (object)array(
                'id' => 222,
                'user_id' => 1,
                'name' => 'Darling New Bathtub by Duravit - $6300'

        ),
        '3' => (object)array(
                'id' => 222,
                'user_id' => 1,
                'name' => 'Darling New Bathtub by Duravit - $6300'

        )                   
  ); 
//print_r(array_column((array)$array, 'id'));
function array_unique_by_key($array, $key = 'id') {
    $found = array(); // Encountered IDs
    $out = array(); // Output array

    foreach ($array as $value) {
        if (!array_key_exists($key, $value)) throw new Exception('Can\'t find key "' . $key . '"');
        $id = $value[$key];

        // If already encountered, skip
        if (in_array($id, $found)) continue;

        // Otherwise, add to found values and to output array
        $found[] = $id;
        $out[] = $value;
    }

    return $out;
}
print_r(array_unique_by_key($array));

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, stdClass given in /in/JI5OK:28 Stack trace: #0 /in/JI5OK(41): array_unique_by_key(Array) #1 {main} thrown in /in/JI5OK on line 28
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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