IS_CALLABLE(3) 1 IS_CALLABLE(3)
is_callable - Verify that the contents of a variable can be called as a function
SYNOPSIS
bool is_callable (callable $name, [bool $syntax_only = false], [string &$callable_name])
DESCRIPTION
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.
PARAMETERS
o $name
- The callback function to check
o $syntax_only
- If set to TRUE the function only verifies that $name 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.
o $callable_name
- Receives the "callable name". In the example below it is "someClass::someMethod". Note, however, that despite the implication
that someClass::SomeMethod() is a callable static method, this is not the case.
RETURN VALUES
Returns TRUE if $name is callable, FALSE otherwise.
EXAMPLES
Example #1
is_callable(3) example
<?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, "
"; // 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, "
"; // someClass::someMethod
?>
SEE ALSO
function_exists(3), method_exists(3).
PHP Documentation Group IS_CALLABLE(3)