note 106046 added to functions.anonymous

A practical example of anonymous functions could be a clean template system. Here you can completely remove messy HTML from your code and keep everything very readable. The last statement that prints the HTML in the example below resembles LISP or other functional type languages. The closure retains the HTML tag from parent scope(which can be initialized in creative ways) and properly closes it after the function call. Items can either nested or composed within HTML tags. You can take this idea further and "map and wrap" columns and rows of recordsets with HTML for display. All that is missing now is the CSS to make it attractive in the browser. Closures can be thought of as a very primitive class that has one "apply" method with some private and public data. Functional programming has been around since the first programming languages in the 1950s. <?php function html ($code , $id="", $class=""){ if ($id !== "") $id = " id = \"$id\"" ; $class = ($class !== "")? " class =\"$class\"":">"; $open = "<$code$id$class"; $close = "</$code>"; return function ($inner = "") use ($open, $close){ return "$open$inner$close";}; } $layout = array('container','header','pmain','lsidebar','rsidebar','footer'); foreach ($layout as $element) $$element = html ("div", $element); $div = html("div", "test"); $bold = html('strong'); $italic = html('i'); $msg= $div($bold($italic("hello from the left sidebar"))); echo $container( $header( "This is the header").$pmain( $lsidebar( $msg).$rsidebar( "This is the right sidebar")).$footer( )); ---- Server IP: 69.147.83.197 Probable Submitter: 24.149.51.104 ---- Manual Page -- http://www.php.net/manual/en/functions.anonymous.php Edit -- https://master.php.net/note/edit/106046 Del: integrated -- https://master.php.net/note/delete/106046/integrated Del: useless -- https://master.php.net/note/delete/106046/useless Del: bad code -- https://master.php.net/note/delete/106046/bad+code Del: spam -- https://master.php.net/note/delete/106046/spam Del: non-english -- https://master.php.net/note/delete/106046/non-english Del: in docs -- https://master.php.net/note/delete/106046/in+docs Del: other reasons-- https://master.php.net/note/delete/106046 Reject -- https://master.php.net/note/reject/106046 Search -- https://master.php.net/manage/user-notes.php