Bug #13874: isset on a associative array does not distinct if key exist

From: raymond@bokenkamp.com Operating system: ALL PHP version: 4.0.6 PHP Bug Type: Unknown/Other Function Bug description: isset on a associative array does not distinct if key exist There's no good way to check weather a key exists in an associative array. The problem is that if the key exists, but the value is null, is treated the same as if the key doesn't exist. The only way I figure is to check: in_array("key", array_keys($array)) but this seams rather expensive. (Compare: perl has an "exists" function ...) Sample: $sample = array("a" => "a", "b" => NULL); print ":".isset($sample['a'])."<br>\n"; print ":".isset($sample['b'])."<br>\n"; print ":".isset($sample['c'])."<br>\n"; print ":".in_array("a", array_keys($sample))."<br>\n"; print ":".in_array("b", array_keys($sample))."<br>\n"; print ":".in_array("c", array_keys($sample))."<br>\n"; -- Edit bug report at: http://bugs.php.net/?id=13874&edit=1