AppendIterator::__construct()
(PHP 5>=5.1.0,PHP 7)
Constructs an AppendIterator
说明
Constructs an AppendIterator.
参数
此函数没有参数。
返回值
没有返回值。
范例
Example#1 Iterating AppendIterator with foreach
<?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; } ?>
以上例程会输出:
0 => Margarita 1 => Siciliana 2 => Hawaii 0 => Cheese 1 => Anchovies 2 => Olives 3 => Pineapple 4 => Ham
Example#2 Iterating AppendIterator with the AppendIterator API
<?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 ); $appendIterator->next(); } ?>
以上例程会输出:
0 => 0 => Margarita 0 => 1 => Siciliana 0 => 2 => Hawaii 1 => 0 => Cheese 1 => 1 => Anchovies 1 => 2 => Olives 1 => 3 => Pineapple 1 => 4 => Ham
注释
CautionWhen usingiterator_to_array()to copy the values of the AppendIterator into an array,you have to set the optional$use_keyargument toFALSE
.When$use_keyis notFALSE
any keys reoccuring in inner iterators will get overwritten in the returned array.There is no way to preserve the original keys.
参见
- AppendIterator::append() Appends an iterator