note 104697 added to language.functions

PHP functions bite. Unlike anonymous functions, named functions are not closures and they cannot access their static environment (i.e. no use clause). Furthermore, the interpreter breaks miserably if you attempt to redefine a function or call an undefined function, throwing an uncatchable error that may break your application horribly. So much for custom error handlers. Finally, named functions are not first-class values, and while you can set a variable to a string with the name of the named function and use () on it to call the function, there's no real function type for named functions, which means you can't tell function names from strings, and, what's worse, it can be a security wart considering you may accidentally read such values from files or user input, as they are mere strings. ---- Server IP: 80.64.47.13 Probable Submitter: 217.125.117.197 ---- Manual Page -- http://www.php.net/manual/en/language.functions.php Edit -- https://master.php.net/note/edit/104697 Del: integrated -- https://master.php.net/note/delete/104697/integrated Del: useless -- https://master.php.net/note/delete/104697/useless Del: bad code -- https://master.php.net/note/delete/104697/bad+code Del: spam -- https://master.php.net/note/delete/104697/spam Del: non-english -- https://master.php.net/note/delete/104697/non-english Del: in docs -- https://master.php.net/note/delete/104697/in+docs Del: other reasons-- https://master.php.net/note/delete/104697 Reject -- https://master.php.net/note/reject/104697 Search -- https://master.php.net/manage/user-notes.php