<?php

class A {
  function foo() {
  }
  function bar() {
  }
}

if (in_array("foo", get_class_methods("A")))
  echo "foo in A, ";
if (in_array("bar", get_class_methods("A")))
  echo "bar in A, ";
if (in_array("baz", get_class_methods("A")))
  echo "baz in A, ";

foo in A, bar in A,