php - Is there a way to check if a function exists within a class?

Question

I'm passing some post data to execute a function based on post data, to determine if this should execute I've tried to use the following:

$SP = new StoredProcedure();

if(function_exists($SP->$_POST['function']))
{
    $SP->$_POST['function']();
}
else
{
    echo 'function does not exist.';
}

Unfortunately this passes the following error:

Notice: Undefined property: StoredProcedure::$getFormList in C:DWASFilesSitesjunglegymVirtualDirectory0sitewwwrootwp-contentpluginsqcoreqcore_waitress.php on line 353 function does not exist.

I'm certain this function does exist, and when I execute it without the function_exists()

Is there a way to check if a function exists when it's inside a class?

Answer 1

method_exists checks for method of a class for a given object:

Docs Link: http://www.php.net/method_exists

if(method_exists($SP, $_POST['function'])) {
    {
        $SP->$_POST['function']();
    }
    else
    {
        echo 'function does not exist.';
    }

function_exists() and method_exists() are for these checks. First is for regular functions and second for OOP functions.