(PHP 5 >= 5.2.0, PHP 7, PHP 8)
AppendIterator::getIteratorIndex — Gets an index of iterators
Gets the index of the current inner iterator.
此函数没有参数。
Returns the zero-based, integer index of the current inner iterator if it exists, or null otherwise.
Example #1 AppendIterator.getIteratorIndex() 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);
foreach ($iterator as $key => $current) {
echo $iterator->getIteratorIndex() . ' ' . $key . ' ' . $current . PHP_EOL;
}
?>
以上例程会输出：
0 a aardwolf 0 b bear 0 c capybara 1 0 apple 1 1 orange 1 2 lemon