note 105261 added to functions.anonymous

<?php /* * An example showing how to use closures to implement a Python-like decorator * pattern. * * My goal was that you should be able to decorate a function with any * other function, then call the decorated function directly: * * Define function: $foo = function($a, $b, $c, ...) {...} * Define decorator: $decorator = function($func) {...} * Decorate it: $foo = $decorator($foo) * Call it: $foo($a, $b, $c, ...) * * This example show an authentication decorator for a service, using a simple * mock session and mock service. */ session_start(); /* * Define an example decorator. A decorator function should take the form: * $decorator = function($func) { * return function() use $func) { * // Do something, then call the decorated function when needed: * $args = func_get_args($func); * call_user_func_array($func, $args); * // Do something else. * }; * }; */ $authorise = function($func) { return function() use ($func) { if ($_SESSION['is_authorised'] == true) { $args = func_get_args($func); call_user_func_array($func, $args); } else { echo "Access Denied"; } }; }; /* * Define a function to be decorated, in this example a mock service that * need to be authorised. */ $service = function($foo) { echo "Service returns: $foo"; }; /* * Decorate it. Ensure you replace the origin function reference with the * decorated function; ie just $authorise($service) won't work, so do * $service = $authorise($service) */ $service = $authorise($service); /* * Establish mock authorisation, call the service; should get * 'Service returns: test 1'. */ $_SESSION['is_authorised'] = true; $service('test 1'); /* * Remove mock authorisation, call the service; should get 'Access Denied'. */ $_SESSION['is_authorised'] = false; $service('test 2'); ?> ---- Server IP: 69.147.83.197 Probable Submitter: 91.125.191.199 ---- Manual Page -- http://www.php.net/manual/en/functions.anonymous.php Edit -- https://master.php.net/note/edit/105261 Del: integrated -- https://master.php.net/note/delete/105261/integrated Del: useless -- https://master.php.net/note/delete/105261/useless Del: bad code -- https://master.php.net/note/delete/105261/bad+code Del: spam -- https://master.php.net/note/delete/105261/spam Del: non-english -- https://master.php.net/note/delete/105261/non-english Del: in docs -- https://master.php.net/note/delete/105261/in+docs Del: other reasons-- https://master.php.net/note/delete/105261 Reject -- https://master.php.net/note/reject/105261 Search -- https://master.php.net/manage/user-notes.php