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@ 2017-07-23T08:34:13Z

<?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'
  ),
  
);
$arr2 = array_msort($messages, array('call-id'=>SORT_ASC, 'type'=>SORT_ASC));
print_r($arr2);
foreach ($messages as $message => $value) {
    if(in_array($value['call-id'], $newArray)) {
        $keyToDelete[] = $message;
    } else {
        $newArray[$value['call-id']] = $value['call-id'];    
    }
}

foreach($keyToDelete as $key => $val) {
    if($messages[$val]['type'] == 'voice') {
        unset($messages[$val]);
    }
}

print_r($messages);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function array_msort() in /in/6P2gi:31 Stack trace: #0 {main} thrown in /in/6P2gi on line 31
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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