Libraries included in Drupal 7 core

There're many JavaScript libraries included in the Drupal 7 core. Many of them are rarely used in custom modules (I haven't used many of them) but they're helpful in some situations and it's nice to kwow what are inside the core as baseline knowledge for Drupal development.

Here is a list of the libraries. Each library comprises of a machine name, title, website and description in the following format.

Using OOP styles for Drupal 7: callbacks

Drupal 7 was created mainly with a procedural style but OOP styles can be used in many parts of it.

For example, there're many callbacks used in the Drupal 7 system. Originally they're expected being functions but some callbacks can be replaced to methods. Here are some examples.

Batch callbacks.

We can use methods for batch callbacks. Because the callback is stored in the database with a serialized manner and invoked with call_user_func_array().

When to use call_user_func() and 'funcname'() in PHP?

There are 2 ways to call a function whose name is set at runtime in PHP. One is call_user_func() and another is 'funcname'().

<?php

$funcname = 'array_sum';

// call_user_func()
call_user_func($funcname, [1, 2, 3]);  // => 6

// 'funcname'()
$funcname([1, 2, 3]);  // => 6

At a glance these 2 methods are completely same but there are some important differences between them. Let's check them one by one.

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