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# CVIII.Standard PHP Library (SPL) Functions

# 介紹

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

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

# 安裝

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

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`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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