Chapter 7. SUPERCHARGED LOOPING WITH SPL
The Standard PHP Library (SPL) was added to PHP in version 5.0 and is enabled by default. In fact, since PHP 5.3, you cannot disable SPL. Yet, in spite of being part of PHP since 2004, it's still poorly documented at the time of this writing. There have been calls within the PHP development team for better documentation, so the situation might have improved by the time you read this.
The name gives the impression that SPL is a framework similar to the Zend Framework (http://framework.zend.com/), CakePHP (www.cakephp.org), or CodeIgniter (www. codeigniter.com). However, SPL is more narrowly focused—at least, ...
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