AppendIterator::key()
(PHP 5>=5.1.0,PHP 7)
Gets the current key
说明
public AppendIterator::key(void) :scalar
Get the current key.
参数
此函数没有参数。
返回值
The current key if it is valid orNULL
otherwise.
范例
Example#1AppendIterator::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; } ?>
以上例程会输出:
a aardwolf b bear c capybara 0 apple 1 orange 2 lemon a aardwolf b bear c capybara 0 apple 1 orange 2 lemon
参见
- Iterator::key() 返回当前元素的键
- AppendIterator::current() Gets the current value
- AppendIterator::valid() Checks validity of the current element
- AppendIterator::next() Moves to the next element
- AppendIterator::rewind() Rewinds the Iterator