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# CXLIII. Standard PHP Library (SPL) Functions

# Introduction

SPL is a collection of interfaces and classes that are meant to solve standard problems.

> Tip: A more detailed documentation of SPL can be found here.

# Installation

This extension is available and compiled by default in PHP 5.

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`RIT_LEAVES_ONLY` (integer)

`RIT_SELF_FIRST` (integer)

`RIT_CHILD_FIRST` (integer)

`CIT_CALL_TOSTRING` (integer)

`CIT_CATCH_GET_CHILD` (integer)

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