Php/docs/splobjectstorage.key

• PHP Manual
• SplObjectStorage
• Returns the index at which the iterator currently is

SplObjectStorage::key

(PHP 5 >= 5.1.0, PHP 7)

SplObjectStorage::key — Returns the index at which the iterator currently is

说明

public SplObjectStorage::key ( ) : int

Returns the index at which the iterator currently is.

参数

此函数没有参数。

返回值

The index corresponding to the position of the iterator.

范例

Example #1 SplObjectStorage::key() example

<?php$s = new SplObjectStorage();$o1 = new StdClass;$o2 = new StdClass;$s->attach($o1, "d1");$s->attach($o2, "d2");$s->rewind();while($s->valid()) {    $index  = $s->key();    $object = $s->current(); // similar to current($s)    var_dump($index);    var_dump($object);    $s->next();}?>

以上例程的输出类似于：

int(0)
object(stdClass)#2 (0) {
}
int(1)
object(stdClass)#3 (0) {
}

参见

• SplObjectStorage::rewind() - Rewind the iterator to the first storage element
• SplObjectStorage::current() - Returns the current storage entry
• SplObjectStorage::next() - Move to the next entry
• SplObjectStorage::valid() - Returns if the current iterator entry is valid