Last updated: Fri, 13 Nov 2009

A classe ArrayIterator

Introdução

Este iterator permite remover e modificar valores e chaves quando iterando arrays e objetos.

Quando você quiser iterar o mesmo array múltiplas vezes você precisa instanciar ArrayObject e criar instâncias de ArrayIterator que é consultado usando foreach ou chamando o método getIterator() manualmente.

Sinopse da classe

ArrayIterator

ArrayIterator implements Iterator , Traversable , ArrayAccess , SeekableIterator , Countable {

/* Métodos */

public void append ( string $value )

public void asort ( void )

__construct ( mixed $array )

public void count ( void )

mixed current ( void )

public void getArrayCopy ( void )

public void getFlags ( void )

mixed key ( void )

public void ksort ( void )

public void natcasesort ( void )

public void natsort ( void )

void next ( void )

public void offsetExists ( string $index )

public mixed offsetGet ( string $index )

public void offsetSet ( string $index , string $newval )

public void offsetUnset ( string $index )

void rewind ( void )

void seek ( int $position )

public string serialize ( void )

public void setFlags ( string $flags )

public void uasort ( string $cmp_function )

public void uksort ( string $cmp_function )

public string unserialize ( string $serialized )

bool valid ( void )

}

Índice

ArrayIterator::append — Append an element
ArrayIterator::asort — Sort array by values
ArrayIterator::__construct — Construct an ArrayIterator
ArrayIterator::count — Count elements
ArrayIterator::current — Retorna o valor do elemento atual do array
ArrayIterator::getArrayCopy — Get array copy
ArrayIterator::getFlags — Get flags
ArrayIterator::key — Retorna a chave do elemento atual do array
ArrayIterator::ksort — Sort array by keys
ArrayIterator::natcasesort — Sort an array naturally, case insensitive
ArrayIterator::natsort — Sort an array naturally
ArrayIterator::next — Avança para o próximo elemento
ArrayIterator::offsetExists — Check if offset exists
ArrayIterator::offsetGet — Get value for an offset
ArrayIterator::offsetSet — Set value for an offset
ArrayIterator::offsetUnset — Unset value for an offset
ArrayIterator::rewind — Recoloca o array no início
ArrayIterator::seek — Aponta para determinada posição
ArrayIterator::serialize — Serialize
ArrayIterator::setFlags — Set behaviour flags
ArrayIterator::uasort — User defined sort
ArrayIterator::uksort — User defined sort
ArrayIterator::unserialize — Unserialize
ArrayIterator::valid — Verifica se o array possui mais elementos

add a note User Contributed Notes
ArrayIterator

Sean Burlington
26-May-2009 12:15


and to iterate recursively use the (sparsely documented)  RecursiveArrayIterator



<?php



$fruits = array(

                "apple" => "yummy",

                "orange" => "ah ya, nice",

                "grape" => "wow, I love it!",

                 "plum" => "nah, not me"

                );



$veg = array("potato" => "chips", "carrot" => "soup");

$grocery = array($fruits, $veg);

$obj = new ArrayObject( $grocery );



$it = new RecursiveIteratorIterator( new RecursiveArrayIterator($grocery));



foreach ($it as $key=>$val)

echo $key.":".$val."\n";



?>



Output

--------

apple:yummy

orange:ah ya, nice

grape:wow, I love it!

plum:nah, not me

potato:chips

carrot:soup

Venelin Vulkov
11-Nov-2008 11:44


Another fine Iterator from php . You can use it especially when you have to iterate over objects



<?php

$fruits = array(

    "apple" => "yummy",

    "orange" => "ah ya, nice",

    "grape" => "wow, I love it!",

    "plum" => "nah, not me"

);

$obj = new ArrayObject( $fruits );

$it = $obj->getIterator();



// How many items are we iterating over?



echo "Iterating over: " . $obj->count() . " values\n";



// Iterate over the values in the ArrayObject:

while( $it->valid() )

{

    echo $it->key() . "=" . $it->current() . "\n";

    $it->next();

}



// The good thing here is that it can be iterated with foreach loop



foreach ($it as $key=>$val)

echo $key.":".$val."\n";



/* Outputs something like */



Iterating over: 4 values

apple=yummy

orange=ah ya, nice

grape=wow, I love it!

plum=nah, not me



?>



Regards.

add a note

ArrayIterator::append

AppendIterator::valid

Last updated: Fri, 13 Nov 2009