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.
<? 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
?> |