array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'splobjectstorage.valid.php', 1 => 'SplObjectStorage::valid', ), 'up' => array ( 0 => 'class.splobjectstorage.php', 1 => 'SplObjectStorage', ), 'prev' => array ( 0 => 'splobjectstorage.unserialize.php', 1 => 'SplObjectStorage::unserialize', ), 'next' => array ( 0 => 'spl.iterators.php', 1 => '迭代器', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/spl/splobjectstorage/valid.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplObjectStorage::valid — Returns if the current iterator entry is valid
此函数没有参数。
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