If you are iterating over a multi-dimensional array of objects, you may be tempted to use a RecursiveArrayIterator within a RecursiveIteratorIterator. You are likely to get baffling results if you do. That is because RecursiveArrayIterator treats all objects as having children, and tries to recurse into them. But if you are interested in having your RecursiveIteratorIterator return the objects in your multi-dimensional array, then you don't want the default setting LEAVES_ONLY, because no object can be a leaf (= has no children).
The solution is to extend the RecursiveArrayIterator class and override the hasChildren method appropriately. Something like the following might be suitable:
<?php
class RecursiveArrayOnlyIterator extends RecursiveArrayIterator {
public function hasChildren() {
return is_array($this->current());
}
}
?>
Of course, this simple example will not recurse into ArrayObjects either!
A classe RecursiveArrayIterator
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Introdução
Este iterador permite desfazer e modificar valores e chaves enquanto itera sobre arrays e objetos, da mesma forma que o ArrayIterator. Além disso, é possível iterar sobre a entrada atual do iterador.
Resumo da classe
/* Constantes herdadas */
/* Constantes */
/* Métodos */
/* Métodos herdados */
}Constantes pré-definidas
Flags do RecursiveArrayIterator
RecursiveArrayIterator::CHILD_ARRAYS_ONLY-
Trata apenas arrays (não objetos) como tendo filhos para iteração recursiva.
Índice
- RecursiveArrayIterator::getChildren — Retorna um iterador para a entrada atual se ela for um array ou um object
- RecursiveArrayIterator::hasChildren — Retorna se a entrada atual é um array ou um objeto
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User Contributed Notes 4 notes
c dot 1 at smithies dot org ¶
12 years ago
mccarthy dot richard at gmail dot com ¶
13 years ago
Using the RecursiveArrayIterator to traverse an unknown amount of sub arrays within the outer array. Note: This functionality is already provided by using the RecursiveIteratorIterator but is useful in understanding how to use the iterator when using for the first time as all the terminology does get rather confusing at first sight of SPL!
<?php
$myArray = array(
0 => 'a',
1 => array('subA','subB',array(0 => 'subsubA', 1 => 'subsubB', 2 => array(0 => 'deepA', 1 => 'deepB'))),
2 => 'b',
3 => array('subA','subB','subC'),
4 => 'c'
);
$iterator = new RecursiveArrayIterator($myArray);
iterator_apply($iterator, 'traverseStructure', array($iterator));
function traverseStructure($iterator) {
while ( $iterator -> valid() ) {
if ( $iterator -> hasChildren() ) {
traverseStructure($iterator -> getChildren());
}
else {
echo $iterator -> key() . ' : ' . $iterator -> current() .PHP_EOL;
}
$iterator -> next();
}
}
?>
The output from which is:
0 : a
0 : subA
1 : subB
0 : subsubA
1 : subsubB
0 : deepA
1 : deepB
2 : b
0 : subA
1 : subB
2 : subC
4 : c
lemoinem dot remove at me dot mlemoine dot name ¶
10 years ago
The RecursiveArrayOnlyIterator behaviour c dot 1 at smithies dot org presented can also be achieved using the (undocumented) flag RecursiveArrayIterator::CHILD_ARRAYS_ONLY (https://github.com/php/php-src/blob/master/ext/spl/spl_array.c#L1970 and https://github.com/php/php-src/blob/master/ext/spl/spl_array.c#L1620)
Edgar ¶
2 years ago
<?php
$array = [
'A','B',
'C'=>[
'D','E',
'F'=>['G','H']
],
'I','J'
];
$iterator = new RecursiveArrayIterator($array);
foreach($iterator as $key=>$value)
{
echo $key,':', $value,'<br>';
}
/**
Output
0:A
1:B
C:Array
2:I
3:J
*/
//-------------
//Recursive...
$array = [
'A','B',
'C'=>[
'D','E',
'F'=>['G','H']
],
'I','J'
];
$it = new RecursiveArrayIterator($array);
$iterator = new RecursiveIteratorIterator($it);
foreach($iterator as $key=>$value)
{
echo $key,':', $value,'<br>';
}
/**
Output
0:A
1:B
0:D
1:E
0:G
1:H
2:I
3:J
*/
?>
