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PHP文档也不是很明确,只是说:SplObjectStorage :: contains和SplObjectStorage :: offsetExists有什么区别?
在存储SplObjectStorage :: offsetExists检查是否有物体存在。(PHP> = 5.3.0)
SplObjectStorage ::包含如果存储包含所提供的对象检查。(PHP> = 5.1.0)
对我来说,这几乎是相同的东西。
问题:除了offsetExists仅在5.3.0中可用,2之间的区别是什么?
小试,我进行了...
$s = new SplObjectStorage();
$o1 = new StdClass();
$o2 = new StdClass();
$o3 = "I'm not an object!";
$s->attach($o1);
var_dump($s->contains($o1));
var_dump($s->offsetExists($o1));
echo '<br>';
var_dump($s->contains($o2));
var_dump($s->offsetExists($o2));
echo '<br>';
var_dump($s->contains($o3));
var_dump($s->offsetExists($o3));
输出:
boolean true
boolean true
boolean false
boolean false
Warning: SplObjectStorage::contains() expects parameter 1 to be object, string given in index.php on line 15
null
Warning: SplObjectStorage::offsetExists() expects parameter 1 to be object, string given in index.php on line 16
null
感谢潜水到源。 – PeeHaa 2012-08-16 08:23:48
太好了,非常感谢! – Tivie 2012-08-16 11:16:17