note 27666 deleted from function.is-callable by cece

Note Submitter: php4 at developersdesk dot com ---- is_callable -- Verify that the contents of a variable can be called as a function. bool is_callable ( mixed var [, bool syntax_only [, string callable_name]]) Verify that the contents of a variable can be called as a function. This can check that a simple variable contains the name of a valid function, or that an array contains a properly encoded object and function name. The var parameter can be either the name of a function stored in a string variable, or an object and the name of a method within the object, like this: array( $SomeObject, 'MethodName' ). If the syntax_only argument is true the function only verifies that var might be a function or method. It will only reject simple variables that are not strings, or an array that does not have a valid structure to be used as a callback. The valid ones are supposed to have only 2 entries, the first of which is an object or a string, and the second a string. The callable_name argument receives the "callable name". In the example below it's "someClass::someMethod". Note, however, that despite the implication that someClass::SomeMethod() is a callable static method, this is not the case. #!/usr/local/bin/php -q <? php // How to check a variable to see if it can be called // as a function. // // Simple variable containing a function // function someFunction() { } $functionVariable = 'someFunction'; var_dump( is_callable( $functionVariable, false, $callable_name )); // bool(true) echo $callable_name, "\n"; // someFunction // // Array containing a method // class someClass { function someMethod() { } } $anObject = new someClass(); $methodVariable = array( $anObject, 'someMethod' ); var_dump( is_callable( $methodVariable, true, $callable_name )); // bool(true) echo $callable_name, "\n"; // someClass:someMethod ?>