array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'splobjectstorage.offsetexists.php', 1 => 'SplObjectStorage::offsetExists', ), 'up' => array ( 0 => 'class.splobjectstorage.php', 1 => 'SplObjectStorage', ), 'prev' => array ( 0 => 'splobjectstorage.next.php', 1 => 'SplObjectStorage::next', ), 'next' => array ( 0 => 'splobjectstorage.offsetget.php', 1 => 'SplObjectStorage::offsetGet', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/spl/splobjectstorage/offsetexists.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
Checks whether an object exists in the storage.
注意:
SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains().
示例 #1 SplObjectStorage::offsetExists() example
<?php
$s = new SplObjectStorage;
$o1 = new stdClass;
$o2 = new stdClass;
$s->attach($o1);
var_dump($s->offsetExists($o1)); // Similar to isset($s[$o1])
var_dump($s->offsetExists($o2)); // Similar to isset($s[$o2])
?>
以上示例的输出类似于:
bool(true) bool(false)