Iterators
PHP Manual

The RecursiveIteratorIterator class

Introduction

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Class synopsis

RecursiveIteratorIterator
RecursiveIteratorIterator implements OuterIterator , Traversable , Iterator {
/* Methods */
mixed current ( void )
int getDepth ( void )
RecursiveIterator getSubIterator ( void )
mixed key ( void )
void next ( void )
void rewind ( void )
bool valid ( void )
}

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Iterators
PHP Manual