Weakref::valid

(PECL weakref >= 0.1.0)

Weakref::valid — Checks whether the object referenced still exists

说明

public Weakref::valid ( void ) : bool

Checks whether the object referenced still exists.

参数

此函数没有参数。

返回值

Returns TRUE if the object still exists and is thus still accessible via Weakref::get(), FALSE otherwise.

参见

  • Weakref::get() - Returns the object pointed to by the weak reference

相关文章
php hashable determines whether an object is equal to the current instancephp apcu 函数 checks if entry existsphp cubrid 函数 check whether the instance pointed by oid existsphp enchant 函数 whether a dictionary exists or not. using non empty tagphp enchant 函数 whether or not word exists in this spelling sessionphp gmagick checks if the object has more imagesphp gmagick checks if the object has a previous imagephp hyperwave api 函数 checks in an objectphp hyperwave api 函数 checks out an objectphp intlcalendar whether this objectʼs time is before that of the passed objectphp phar determines whether a file exists in the pharphp quickhashintset this method checks whether a key is part of the setphp spldoublylinkedlist checks whether the doubly linked list is emptyphp splobjectstorage checks whether an object exists in the storagephp splpriorityqueue checks whether the queue is emptyphp weakmap checks whether a certain object is in the mapphp weakref acquires a strong reference on that objectphp weakref returns the object pointed to by the weak referencephp weakref checks whether the object referenced still existsphp yaf registry check whether an item exists
关注编程学问公众号