Description:
------------
This is a request for a Runkit function that adds PHP code either at the beginning or at the end of an already defined function or method.

This can currently be achieved by the following

  runkit_method_rename('Foo', 'bar', '__bar');
  runkit_method_add('Foo', 'bar', '', "echo 'Hello '; Foo::__bar(); echo '!';");

but a convenience function for this would be nice.

Reproduce code:
---------------
<?php
class Foo {
  public function bar() {
    print 'World';
  }
}

runkit_method_prepend_code('Foo', 'bar', "print 'Hello ';");
runkit_method_append_code('Foo', 'bar', "print '!';");

$foo = new Foo;
$foo->bar();
?>

Expected result:
----------------
Hello World.