AppendIterator::__construct
PHP function
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(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Constructs an AppendIterator
Description
AppendIterator::__construct()
Constructs an AppendIterator.
Parameters Parameters
Examples
Iterating AppendIterator with foreach
php
<?php
$pizzas = new ArrayIterator(array('Margarita', 'Siciliana', 'Hawaii'));
$toppings = new ArrayIterator(array('Cheese', 'Anchovies', 'Olives', 'Pineapple', 'Ham'));
$appendIterator = new AppendIterator;
$appendIterator->append($pizzas);
$appendIterator->append($toppings);
foreach ($appendIterator as $key => $item) {
echo $key . ' => ' . $item . PHP_EOL;
}
?>The above example will output:
output
0 => Margarita
1 => Siciliana
2 => Hawaii
0 => Cheese
1 => Anchovies
2 => Olives
3 => Pineapple
4 => HamIterating AppendIterator with the AppendIterator API
php
<?php
$pizzas = new ArrayIterator(array('Margarita', 'Siciliana', 'Hawaii'));
$toppings = new ArrayIterator(array('Cheese', 'Anchovies', 'Olives', 'Pineapple', 'Ham'));
$appendIterator = new AppendIterator;
$appendIterator->append($pizzas);
$appendIterator->append($toppings);
while ($appendIterator->valid()) {
printf(
'%s => %s => %s%s',
$appendIterator->getIteratorIndex(),
$appendIterator->key(),
$appendIterator->current(),
PHP_EOL
);
$appendIterator->next();
}
?>The above example will output:
output
0 => 0 => Margarita
0 => 1 => Siciliana
0 => 2 => Hawaii
1 => 0 => Cheese
1 => 1 => Anchovies
1 => 2 => Olives
1 => 3 => Pineapple
1 => 4 => HamNotes
Caution
When using iterator_to_array() to copy the values of the AppendIterator into an array, you have to set the optional use_key argument to false. When use_key is not false any keys reoccurring in inner iterators will get overwritten in the returned array. There is no way to preserve the original keys.
See Also
AppendIterator::append