Delegate can be used to manage and call closures and callback functions, it can also add to a list closures, callback function or object functions. Closures and functions can be executed using this script, all at once. Requirements:- PHP 5.2 or higher

pClosure is a string with code is passed as parameter to the closure function.pClosure object may be assigned to a variable, so when the variable is invoked as a callable function, it executes code of the closure string.Requirements: PHP 5.0 or higher