(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplObjectStorage::valid — Returns if the current iterator entry is valid
Returns if the current iterator entry is valid.
此函数没有参数。
Returns true if the iterator entry is valid, false otherwise.
示例 #1 SplObjectStorage::valid() example
<?php
$s = new SplObjectStorage();
$o1 = new stdClass;
$o2 = new stdClass;
$s->attach($o1, "d1");
$s->attach($o2, "d2");
$s->rewind();
while($s->valid()) {
echo $s->key()."\n";
$s->next();
}
?>以上示例的输出类似于：
0 1