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bool is_callable ( callable $name [, bool $syntax_only = false [, string &$callable_name ]] )

<?php
// Check if a variable is a callable 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

?>

bool(true)
someFunction
bool(true)
someClass::someMethod