Iteradores
PHP Manual

A classe FilterIterator

Introdução

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Sinopse da classe

abstract FilterIterator extends IteratorIterator implements OuterIterator , Traversable , Iterator {
/* Métodos */
public abstract bool accept ( void )
public __construct ( Iterator $iterator )
mixed current ( void )
Iterator getInnerIterator ( void )
mixed key ( void )
void next ( void )
void rewind ( void )
bool valid ( void )
}

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Iteradores
PHP Manual