php is_function() to determine if a variable is a function

Question

I was pretty excited to read about anonymous functions in php, which let you declare a variable that is function easier than you could do with create_function. Now I am wondering if I have a function that is passed a variable, how can I check it to determine if it is a function? There is no is_function() function yet, and when I do a var_dump of a variable that is a function::

$func = function(){     echo 'asdf'; }; var_dump($func); 

I get this:

object(Closure)#8 (0) { }  

Any thoughts on how to check if this is a function?

Answer 1

Use is_callable to determine whether a given variable is a function. For example:

$func = function() {       echo 'asdf';   };  if( is_callable( $func ) ) {     // Will be true. }