PHP Manual
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# CXVIII. Standard PHP Library (SPL) Functions

# 简介

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

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

# 安装

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

# 预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

`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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