(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplObjectStorage::key — Returns the index at which the iterator currently is
此函数没有参数。
The index corresponding to the position of the iterator.
示例 #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();
}
?>以上示例的输出类似于：
int(0)
object(stdClass)#2 (0) {
}
int(1)
object(stdClass)#3 (0) {
}