note 119459 added to control-structures.for

when iterating a multidimentional array like this: for ($i = 0; $i < $size_x; $i++) { for ($j = 0; $j < $size_y; $j++) { do_something($a[$i][$j]); } } it is faster to use $a[$i][$j] than using $a[$j][$i] for ($i = 0; $i < $size_x; $i++) { for ($j = 0; $j < $size_y; $j++) { do_something($a[$j][$i]); } } if you know about how RAM works you understand why ---- Server IP: 72.52.91.14 Probable Submitter: 186.15.1.11 ---- Manual Page -- http://php.net/manual/en/control-structures.for.php Edit -- https://master.php.net/note/edit/119459 Del: integrated -- https://master.php.net/note/delete/119459/integrated Del: useless -- https://master.php.net/note/delete/119459/useless Del: bad code -- https://master.php.net/note/delete/119459/bad+code Del: spam -- https://master.php.net/note/delete/119459/spam Del: non-english -- https://master.php.net/note/delete/119459/non-english Del: in docs -- https://master.php.net/note/delete/119459/in+docs Del: other reasons-- https://master.php.net/note/delete/119459 Reject -- https://master.php.net/note/reject/119459 Search -- https://master.php.net/manage/user-notes.php