note 127121 added to function.array-merge

Be careful with the return value. In the "Return Values" section it states the next: > Returns the resulting array. If called without any arguments, returns an empty array. By that, we can assume that the result of the function is ALWAYS an array, as there are no other statements. Indeed, when one of the values is not an array and the PHP version is < 8.0, it can be NULL and the "Warning" will be generated. With PHP >= 8.0 it will be a "Fatal error". <?PHP foreach ([null, false, ''] as $item) { $list = array_merge($item, [1, 2]); echo null === $list ? 'YES' : 'NO'; // It's always YES here } ?> ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.47 (proxied: 188.163.44.2) ---- Manual Page -- https://php.net/manual/en/function.array-merge.php Edit -- https://main.php.net/note/edit/127121 Del: integrated -- https://main.php.net/note/delete/127121/integrated Del: useless -- https://main.php.net/note/delete/127121/useless Del: bad code -- https://main.php.net/note/delete/127121/bad+code Del: spam -- https://main.php.net/note/delete/127121/spam Del: non-english -- https://main.php.net/note/delete/127121/non-english Del: in docs -- https://main.php.net/note/delete/127121/in+docs Del: other reasons-- https://main.php.net/note/delete/127121 Reject -- https://main.php.net/note/reject/127121 Search -- https://main.php.net/manage/user-notes.php