(PHP 5 >= 5.1.0, PHP 7)
AppendIterator::key — Gets the current key
public AppendIterator::key ( ) : scalar
Get the current key.
This function has no parameters.
The current key if it is valid or NULL otherwise.
Example #1 AppendIterator::key() basic example
<?php$array_a = new ArrayIterator(array('a' => 'aardwolf', 'b' => 'bear', 'c' => 'capybara'));$array_b = new ArrayIterator(array('apple', 'orange', 'lemon'));$iterator = new AppendIterator;$iterator->append($array_a);$iterator->append($array_b);// Manual iteration$iterator->rewind();while ($iterator->valid()) { echo $iterator->key() . ' ' . $iterator->current() . PHP_EOL; $iterator->next();}echo PHP_EOL;// With foreachforeach ($iterator as $key => $current) { echo $key . ' ' . $current . PHP_EOL;}?>
The above example will output:
a aardwolf b bear c capybara 0 apple 1 orange 2 lemon a aardwolf b bear c capybara 0 apple 1 orange 2 lemon