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@ 2017-07-23T08:38:46Z

<?php
$messages = array(

  'message1'=>array(
    'type'=>'voice',
    'call-id'=>'11',
    'id'=>'message1'
  ),
  'message2'=>array(
    'type'=>'voice',
    'call-id'=>'44',
    'id'=>'message2'
  ),
  'message3'=>array(
    'type'=>'text',
    'call-id'=>'44',
    'id'=>'message3'
  ),
  'message4'=>array(
    'type'=>'text',
    'call-id'=>'55',
    'id'=>'message4'
  ),
  'message5'=>array(
    'type'=>'voice',
    'call-id'=>'55',
    'id'=>'message5'
  ),

);

foreach ($messages as $message => $value) {
    $unique[$value['call-id']] = $value;
    // this will override the previous value with the same key if exists
}


$unique = usort($unique, "cmp");
print_r($unique);
foreach ($unique as $key => $value) {
    $array[$value['id']] = $value;
}

echo '<pre>';
print_r($array);


function cmp($a, $b) {
    return $a["call-id"] - $b["call-id"];
}

Output for git.master, git.master_jit: 1 Warning: foreach() argument must be of type array|object, bool given in /in/blfIJ on line 40 <pre> Warning: Undefined variable $array in /in/blfIJ on line 45
Output for rfc.property-hooks: 1 Warning: foreach() argument must be of type array|object, true given in /in/blfIJ on line 40 <pre> Warning: Undefined variable $array in /in/blfIJ on line 45

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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