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Ce document utilise Manuel du site Web PHP chinois Libérer
(PHP 5 >= 5.1.0)
AppendIterator::key — Gets the current key
Get the current key.
此函数没有参数。
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 ;
}
?>
以上例程会输出:
a aardwolf b bear c capybara 0 apple 1 orange 2 lemona aardwolf b bear c capybara 0 apple 1 orange 2 lemon