note 122017 added to ref.array

*Beware* that there is no proper built-in array-concatenation function. Consider the following two arrays: $arr1 = array(1, 2); $arr2 = array("red", "green", "blue"); If you try print_r($arr1 + $arr2); it produces the output Array ( [0] => 1 [1] => 2 [2] => blue ) which is probably not what you expect. The problem is that PHP tries to combine arrays and dictionaries into a single concept, which doesn’t quite work right as either. Here is a proper array-concatenation function, which can take any number of array arguments: function array_concat(...$arrays) /* concatenates the items of a sequence of arrays. */ { $result = array(); foreach ($arrays as $arr) { foreach ($arr as $elt) { $result[] = $elt; } /*foreach*/ } /*foreach*/ return $result; } /*array_concat*/ The output from print_r(array_concat($arr1, $arr2)); is the much more reasonable Array ( [0] => 1 [1] => 2 [2] => red [3] => green [4] => blue ) ---- Server IP: 208.43.231.9 Probable Submitter: 118.92.45.19 ---- Manual Page -- http://php.net/manual/en/ref.array.php Edit -- https://master.php.net/note/edit/122017 Del: integrated -- https://master.php.net/note/delete/122017/integrated Del: useless -- https://master.php.net/note/delete/122017/useless Del: bad code -- https://master.php.net/note/delete/122017/bad+code Del: spam -- https://master.php.net/note/delete/122017/spam Del: non-english -- https://master.php.net/note/delete/122017/non-english Del: in docs -- https://master.php.net/note/delete/122017/in+docs Del: other reasons-- https://master.php.net/note/delete/122017 Reject -- https://master.php.net/note/reject/122017 Search -- https://master.php.net/manage/user-notes.php