(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; $iterator->next(); } echo PHP_EOL; // With foreach foreach ($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
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https://www.php.net/manual/en/appenditerator.key.php