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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();
Output for 7.0.6 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
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 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 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 5.5.24 - 5.5.35, 5.6.8 - 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)

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