unset function

Before saving information to the PHPSession, you must use the session_start () function to start the session. this function must be called before the & lt; html & gt; tag. The code is as follows: Before saving information to the PHP Session, you

Hello, my audience, Hello! hello, everyone! welcome to the IT program Lecture Hall of the story about underpants. today I will share with you a little bit of knowledge. Is the interaction between the frontend and the backend. There are two

PHP has several functions that can be used to test the state of a variable. The first function is isset (). It has the following function prototype: boolisset (mixedvar); [; mixedvar [,...]). This function requires a variable name as the

Summary of common magic methods in php and php magic Summary This article summarizes common magic methods in php in detail and shares them with you for your reference. The specific content is as follows: 1. PHP regards all methods starting with "_"

Summary of magic methods in PHP: __construct, _ destruct, _ call, _ callstatic, __get, _ set, _ isset, _ unset, _ sleep, _ wakeup, _ tostring, _ set_state, _ clone and _ autoload 1. _ Get, _ setThese two methods are designed for attributes that

This article will introduce 10 PHP-related Array Operations and help you improve development efficiency. 1. Add array elements PHP is a weak type language, which means you do not need to declare an array and its size. On the contrary, you can

We can see this interesting test on Unix Review and share it with you. UnixReview.com May 1, 2007 Test Your Knowledge of PHP By Emmett Dulaney From: http://www.unixreview.com/documents/s=10130/ur0705d/ Increasingly, PHP seems to be the

In PHP versions later than PHP 5, classes in PHP can use magic methods. It specifies that all methods starting with two underscores (_) are retained as magic methods. Therefore, we recommend that you do not start with _ In the function name unless

PHP session processing function, session PHP Session variable When you run an application, you open it, make some changes, and then close it. This is like a session. The computer knows who you are. It knows when to start the application and when to

[PHP Source Code Reading] empty and isset functions, emptyisset Recently, I was asked how to judge variables when using empty and isset functions in PHP. At the beginning, I was very frustrated, because I was just a bit confused, in order to

PHP arrays are still commonly used. So I studied the assignment of PHP arrays and shared them here. I hope they will be useful to you. An array is a set of variables stored in computer memory. These variables can be of different types, including

When I read the PHP manual, I found the following code: Copy codeThe Code is as follows: Function Test () { Static $ count = 0; $ Count ++; Echo $ count; If ($ count Test (); } $ Count --; } ?> The execution result is as follows:This is a recursive

The following is an example of PHP memory_get_usage: Copy codeThe Code is as follows: echo memory_get_usage (), ''; // 143952 $ Tmp = str_repeat ('HTTP: // blog.micxp.com/', 4000 ); Echo memory_get_usage (), ''; // 232048 Unset ($ tmp ); Echo

When using static variables, the most important thing to note is to clear them. If we do not clear them, we may encounter some problems, today, let's take a look at the details and examples of PHP static variables, as shown below. When using static

Learn more about how to delete elements from PHP arrays. When learning PHP, you may encounter the PHP array deletion problem. here we will introduce the solution to the PHP array deletion problem, and share it with you here. If you have learned the

Reference assignment: this means that the new variable simply references the original variable (in other words, "become its alias" or "point. Changing new variables will affect the original variables, and vice versa. Value assignment: When a value

PHPmemory_get_usage () manages the memory. In actual encoding, to view and operate the memory, many programmers first think of the following example: PHPmemory_get_usage (): echomemory_get_usage (in actual encoding, to view and operate the memory,

Reference Assignment: this means that the new variable simply references the original variable (in other words, "become its alias" or "point. Changing new variables will affect the original variables, and vice versa. Reference Assignment: this means

47-Reference count vs. write-time replicationFor PHP, which needs to handle multiple requests at the same time, the application and release of memory should be cautious, accidentally will become a big mistake. On the other hand, in addition to the

SimpleXML is a way for PHP to process XML files, and the other is Dom processing, which only says SimpleXML.At present, PHP processing XML with more, more mature or DOM. But Dom is still more criticized for its speed and the amount of code.Some of