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This article mainly explains "what is the meaning of PHP handle". The explanation content in this article is simple and clear, easy to learn and understand. Please follow the idea of Xiaobian and go deep into it slowly to study and learn "what is the meaning of PHP handle" together!

Handle, has many meanings, the first refers to programming, the second refers to Windows programming. Most of them now refer to programming/programming.

The first explanation is that handles are a special kind of smart pointer. Handles are used when an application refers to memory blocks or objects managed by other systems (e.g., databases, operating systems).

The second explanation: the basis of the entire Windows programming. A handle is a unique integer value, a 4-byte (8-byte in 64-bit programs) long number, used to identify different objects and instances of the same class in an application, such as a window, button, icon, scroll bar, output device, control, or file. An application can access information about an object through a handle, but the handle is not a pointer and the program cannot use the handle to read information directly from the file. If the handle is not in the I/O file, it is useless. Handles are unique integers used by Windows to identify objects created or used in applications, and Windows makes extensive use of handles to identify objects.

What does PHP handle mean?

A handle is a resource that operates an object, that is, operates a target, and a handle is a callback function. A handle can also be understood as a handle. Having a handle is like having resources. Operating on handles is equivalent to operating on resources. In fact, objects are not fixed in memory addresses, fixed handles point to the address where the corresponding object is located in memory. It can also be said that a handle is a channel, an object that maintains a certain state.

A resource cannot be used directly under certain conditions, so handles are used to manipulate it.

For example:

1>> Operation database needs to verify identity, login database handle with login information can operate the database.

2>> The reading and writing of the file has the position of the file pointer, and the reading and writing need to control the position of the pointer. The handle forms a channel with state at this time.

3>> Timer is a state, assign timer to handle, handle can be processed after triggering something (cancel timing, trigger in advance)

A special intelligent pointer when an application references another system {{database}}.|| The handle is used when a memory block or object managed by the operating system}}.

Take a chestnut: For example, if the object is your female ticket, then the handle is the mobile phone number of your female ticket. You don't need to pay attention to where your female ticket is at all times, because you can call directly to see where she is. When you release the handle, you just call and say,"Let's break up"!

Examples:

//Create resources

//Manipulate resources based on handles

$data = curl_init();

curl_setopt($data,CURLOPT_URL,$url);

curl_setopt($data,CURLOPT_NOBODY,TRUE);

//execute this resource according to the handle

curl_setope($data,CURLOPT_RETURNTRANSFET,TRUE);

$head = curl_exec($ch);

Thank you for reading, the above is "PHP handle is what it means" content, after the study of this article, I believe we have a deeper understanding of PHP handle is what this problem means, the specific use of the situation also needs to be verified. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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