PHP-空有类？

涉及到Symfony 1.4和Propel,但我不确定它们是否会导致以下所述的奇怪行为.

$this->_parent = TestPeer::retrieveByPK($this->getParentId());
var_dump(get_class($this->_parent), $this->_parent);

打印出“ Test”和“ null”.

怎么会这样呢

聚苯乙烯

1 / $this-> getParentId()返回整数,并且数据库中没有相应的记录,因此$this-> _parent应该为空.

2 / PHP 5.5.6,xdebug,opcache

解决方法:

从The PHP Manual引用get_class：

5.3.0 NULL became the default value for object, so passing NULL to object now has the same result as not passing any value.

连同：

Returns the name of the class of which object is an instance. Returns
FALSE if object is not an object.

If object is omitted when inside a class, the name of that class is
returned.

…表示在传递null时,您将获得包含该调用的类的名称.

标签：symfony-1-4,propel,php
来源： https://codeday.me/bug/20191030/1966018.html