note 72430 added to function.create-function

It is possible to use this call to implement continuations but you need a small workaround for a nagging feature of create_function(). The result of this function does start with a null character which might result in loosing the name of your function altogether!. (See also bug report #40160) Here is a bit of code to play with. The result should be 'f(2, 2) = 6' <?php /* continuations in php. vim:nu Code inspired by http://www.ps.uni-sb.de/~duchier/python/continuations.html */ function writeln($s) { echo "$s\n"; } function lambda0 ($args, $code) { return substr(create_function ($args, $code), 1); } function L ($l) { if (strncmp($l, 'lambda_', 7) === 0) return "\0$l"; else return $l; } function mul ($x, $y, $c) { $f = L($c); $f($x*$y); } function add ($x, $y, $c) { $f = L($c); $f($x+$y); } function mal ($x, $y, $c) { mul(2, $x, lambda0 ('$v', "add(\$v, $y, $c);")); } function f($x, $y) { mal($x, $y, lambda0 ('$v', "writeln(\"f($x, $y) = \$v\");")); } f(2, 2); ?> ---- Server IP: 83.137.20.120 Probable Submitter: 131.174.244.4 ---- Manual Page -- http://www.php.net/manual/en/function.create-function.php Edit -- https://master.php.net/note/edit/72430 Del: integrated -- https://master.php.net/note/delete/72430/integrated Del: useless -- https://master.php.net/note/delete/72430/useless Del: bad code -- https://master.php.net/note/delete/72430/bad+code Del: spam -- https://master.php.net/note/delete/72430/spam Del: non-english -- https://master.php.net/note/delete/72430/non-english Del: in docs -- https://master.php.net/note/delete/72430/in+docs Del: other reasons-- https://master.php.net/note/delete/72430 Reject -- https://master.php.net/note/reject/72430 Search -- https://master.php.net/manage/user-notes.php