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run code in 150+ php & hhvm versions
Bugs & Features
<?php function array_flip_keys($array, $x, $y) { if(array_key_exists($x, $array) && array_key_exists($y, $array)) { $result = []; foreach($array as $key=>$value) { switch($key) { case $x: $result[$y]=$array[$y]; continue; case $y: $result[$x]=$array[$x]; continue; default: $result[$key]=$value; } } return $result; } return $array; } $array = ['foo', 'bar', 'baz', 'feo']; var_dump(array_flip_keys($array, 1, 3));
Output for 5.4.0 - 7.1.0
array(4) { [0]=> string(3) "foo" [3]=> string(3) "feo" [2]=> string(3) "baz" [1]=> string(3) "bar" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/9jK8Q on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/9jK8Q on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/9jK8Q on line 7
Process exited with code 255.