PHP: is_callable() function


The is_callable() function is used to test that the contents of a variable, whether it can be called as a function or not.


(PHP 4 and above)


is_callable(var_name, syntax_only, callable_name)


Name Description Required /
var_name Either the name of a function stored in a string variable, or an object and the name of a method within the object. Required Mixed*
syntax_only If set to TRUE, the function only verifies if it is a function or a method. It rejects simple variables those are not strings and an array not having a valid structure. Optional Boolean
callable_name Receives a "callable name". This option is implemented only for classes. Optional String

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

TRUE if var_name is callable, FALSE otherwise.

Value Type: Boolean.

Example :

function foo(){
echo is_callable('foo');
echo is_callable('bar');

Output :


View the example in the browser

Practice here online :

See also

PHP Function Reference

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Next: is_double

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