SplObjectStorage::key()

(PHP 5 >= 5.1.0, PHP 7)

Returns the index at which the iterator currently is

说明

publicSplObjectStorage::key(void) : 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

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