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@ 2022-11-02T17:52:52Z

<?php

$array =    [    
[  
    "id"           =>  1,  
    "recipient"    => "User",
    "userName"     => "Max Mustermann",
    "locationName" => "Test Location"
],      
[  
    "id"           =>  2,  
    "recipient"    => "Location",
    "userName"     => "Susi Mustermann",
    "locationName" => "Another Location"
],     
[  
    "id"           =>  3,  
    "recipient"    => "Location",
    "userName"     => "Susi Mustermann",
    "locationName" => "Wow Much Location"
],     
[  
    "id"           =>  4,  
    "recipient"    => "User",
    "userName"     => "Fritz Kalkbrenner",
    "locationName" => "Good Music"
],     
[  
    "id"           =>  5,  
    "recipient"    => "Location",
    "userName"     => "Paul Kalkbrenner",
    "locationName" => null
],  
];

usort($array,function($a,$b){
  $sort2key = strtolower($a['recipient']).'Name';
  return $a['recipient'] <=> $b['recipient']
  ?: is_null($a['locationName']) <=> is_null($b['locationName'])
  ?: $a[$sort2key] <=> $b[$sort2key];
});

var_export($array);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'id' => 2, 'recipient' => 'Location', 'userName' => 'Susi Mustermann', 'locationName' => 'Another Location', ), 1 => array ( 'id' => 3, 'recipient' => 'Location', 'userName' => 'Susi Mustermann', 'locationName' => 'Wow Much Location', ), 2 => array ( 'id' => 5, 'recipient' => 'Location', 'userName' => 'Paul Kalkbrenner', 'locationName' => NULL, ), 3 => array ( 'id' => 4, 'recipient' => 'User', 'userName' => 'Fritz Kalkbrenner', 'locationName' => 'Good Music', ), 4 => array ( 'id' => 1, 'recipient' => 'User', 'userName' => 'Max Mustermann', 'locationName' => 'Test Location', ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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