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run code in 200+ php & hhvm versions
Bugs & Features
<?php function keys_with_reference(array $array) { $clone = $array; $testObject = new \stdClass; $keys_with_reference = array(); foreach ($array as $k => $v) { $clone[$k] = $testObject; if ($array[$k] === $testObject) { $array[$k] = $v; $keys_with_reference[$k] = TRUE; } } return $keys_with_reference; } function use_reference(&$v) { static $static; $static = $v; } $x = array( 'left' => array(), 'right' => array(), ); print_r(keys_with_reference($x)); use_reference($x['left']); print_r(keys_with_reference($x)); $left = &$x['left']; print_r(keys_with_reference($x));
based on vmnRe
Output for 5.3.0 - 7.2.8
Array ( ) Array ( ) Array ( [left] => 1 )
Output for 5.1.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/PiliK on line 5 Array ( ) Array ( ) Array ( [left] => 1 )
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/PiliK on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/PiliK on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/PiliK on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/PiliK on line 3
Process exited with code 255.