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@ 2014-02-24T09:45:03Z

<?php
$actualArray = array(
    user1 => array(
        'name' => 'User1',
        'age' => '25',
        'lastLogin' => '2013-08-16'
    ),
    user1 => array(
        'name' => 'User1',
        'age' => '25',
        'lastLogin' => '2013-08-10'
    ),
    user2 => array(
        'name' => 'User2',
        'age' => '35',
        'lastLogin' => '2013-08-08'
    ),
    user1 => array(
        'name' => 'User1',
        'age' => '25',
        'lastLogin' => '2013-07-10'
    )
);
function uniqueAssocArray($array, $uniqueKey) {
  if (!is_array($array)) {
    return array();
  }
  $uniqueKeys = array();
  foreach ($array as $key => $item) {
    if (!in_array($item[$uniqueKey], $uniqueKeys)) {
      $uniqueKeys[$item[$uniqueKey]] = $item;
    }
  }
  return $uniqueKeys;
}
var_dump(uniqueAssocArray($actualArray, 'name'));

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Undefined constant "user1" in /in/o63Ys:3 Stack trace: #0 {main} thrown in /in/o63Ys on line 3
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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