预定义常量
下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
Warning
SPL uses class constants since PHP 5.1. Prior releases use global constants
in the form RIT_LEAVES_ONLY.
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RecursiveIteratorIterator::LEAVES_ONLY
(integer)
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RecursiveIteratorIterator::SELF_FIRST
(integer)
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RecursiveIteratorIterator::CHILD_FIRST
(integer)
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CachingIterator::CALL_TOSTRING
(integer)
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CachingIterator::CATCH_GET_CHILD
(integer)
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