To check if the class method exists or not we use a function method_exists() in PHP. It check that the class method exist in the given object.

Syntax:

method_exists($object,$method);

As you have seen the syntax of method_exists() above, it includes two parameters:

• $object is the object instance or class name
• $method is the name of the function you want to check.

For example:

<?php
class ParentClass {

   function demo() { }
}

class ChildClass extends ParentClass { }

$p = new ParentClass();
$c = new ChildClass();

// all return true
if(method_exists($p, 'demo')){
    echo "demo exist in parent";
}
else
{
    echo "demo does not exist in parent";
}
?>

Output of above script is as follows:

demo exist in parent