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<?php class myClass { private $a = [ 'foo-test' => [1], '-' => [2], 'bar-test' => [3] ]; private function _mySort($x, $y) { print_r($this->a); var_dump($x); var_dump($x == 'foo-test' || $x == '-' || $x == 'bar-test'); if (!isset($this->a[$x])) { throw new Exception('Missing X: "' . $x . '"'); } if (!isset($this->a[$y])) { throw new Exception('Missing Y: "' . $y . '"'); } return ($x < $y ? -1 : ($x > $y ? 1 : 0)); } public function __construct() { uksort($this->a, [$this, '_mySort']); } } new myClass();
based on llbp4
Output for 7.0.6 - 7.1.7, 7.2.0
Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "foo-test" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "bar-test" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "foo-test" bool(true)
Output for 7.1.10

Process exited with code 137.
Output for 7.0.0 - 7.0.5
Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "foo-test" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "bar-test" bool(true) Array ( [-] => Array ( [0] => 2 ) [foo-test] => Array ( [0] => 1 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "foo-test" bool(true) Fatal error: Uncaught Exception: Missing X: "foo-test" in /in/faOWb:17 Stack trace: #0 [internal function]: myClass->_mySort('foo-test', 'bar-test') #1 /in/faOWb(29): uksort(Array, Array) #2 /in/faOWb(33): myClass->__construct() #3 {main} thrown in /in/faOWb on line 17
Process exited with code 255.
Output for 5.4.11 - 5.6.28
Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(1) "-" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "bar-test" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "foo-test" bool(true) Array ( [foo-test] => Array ( [0] => 1 ) [-] => Array ( [0] => 2 ) [bar-test] => Array ( [0] => 3 ) ) string(8) "bar-test" bool(true)
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/faOWb on line 5
Process exited with code 255.