note 97694 added to functions.variable-functions

Variable functions allows higher-order programming. Here is the classical map example. <?php /* * Map function. At each $element of the $list, calls $fun([$arg1,[$arg2,[...,]],$element,$accumulator), * stores the return value into $accumulator for the next loop. Returns the last return value of the function, * * Notes : uses call_user_func_array() so passing parameters doesn't depend on $fun signature * It also returns FALSE upon error. * Please check the php documentation for more information */ function map($fun, $list,$params=array()){ $acc=NULL; $last=array_push($params, NULL,$acc)-1; // alloc $element and $acc at the end foreach($list as $params[$last-1]){ $params[$last]=call_user_func_array($fun , $params ); } $acc=array_pop($params); return $acc; } function add($element,$acc){ // maybe only with multi-length function if ($acc == NULL); return $acc=$element+$acc; } $result=0; $result=addTo($result,1); $result=addTo($result,2); $result=addTo($result,3); echo "result = $result\n"; $result=0; $result=map('addTo',array(1,2,3)); echo "result= $result\n"; ?> ---- Server IP: 69.147.83.197 Probable Submitter: 217.136.108.206 ---- Manual Page -- http://www.php.net/manual/en/functions.variable-functions.php Edit -- https://master.php.net/note/edit/97694 Del: integrated -- https://master.php.net/note/delete/97694/integrated Del: useless -- https://master.php.net/note/delete/97694/useless Del: bad code -- https://master.php.net/note/delete/97694/bad+code Del: spam -- https://master.php.net/note/delete/97694/spam Del: non-english -- https://master.php.net/note/delete/97694/non-english Del: in docs -- https://master.php.net/note/delete/97694/in+docs Del: other reasons-- https://master.php.net/note/delete/97694 Reject -- https://master.php.net/note/reject/97694 Search -- https://master.php.net/manage/user-notes.php