unset function

Summary of the methods for deleting and clearing sessions in php, phpsession. Summary of methods for deleting and clearing sessions in php, phpsessionsession deletion and clearing is very important. if we define it, we can clear the specified

In PHP, the analysis of global and $ GLOBALS [] was originally thought that both global and $ GLOBALS had the same syntax, but in actual application, we found that, there is a big difference between the two! Let's take a look at the following

In php, the difference between global and $ GLOBALS [& quot;] was originally found that both global and $ GLOBALS have the same syntax, however, in actual use, it is found that the difference between the two is still very big! Let's take a look at

A Memory Overflow SolutionWhen doing statistical analysis of the data, often encounter large arrays, memory overflow may occur, here to share my solution. Or an example to illustrate the problem, as follows:Assuming that the number of records stored

Chapter 2 client Storage1. cookie① It was originally used to store session information on the client.1.1 restrictions① Cookie is bound to a specific domain name in nature. When a cookie is set and a request is sent to the domain name that creates it,

Some friends say that these two are actually differences in writing. Let me prove the difference between global and $ GLOBALS. If you need them, please refer to them for details. According to the official explanation 1. $ GLOBALS ['var'] is an

1. Use extends to implement inheritance, overload, and magic methods. When classBextendsA is declared, $ bnewB () can be called in B without the method in (); $ B-A's method (); $ B-A's attribute 1; $ B-B's method (); if $ anewA (); You Can $ method

PHP unset destroys variables and frees memory issues The following are quoted from http://leepiao.blog.163.com/blog/static/485031302010718105814266/, a floating blog ? ? The PHP unset () function is used to clear, destroy variables, and we can

Session Delete Clear is very fastidious if we can clear the specified variable if we are not careful to remove all the sessions, let's take a look at some summary. The first way:unset ($_session[' xxx ']) deletes a single session,unset ($_session['

One, what is the Magic method:PHP provides us with a series of functions that begin with __, which do not need to be called manually, and are called automatically at the right time, such functions as magic functions.For example: 1

A Memory Overflow Solution When doing statistical analysis of data, often encounter large arrays, memory overflow may occur, here to share my solution. Use examples to illustrate the problem, as follows:Assuming that the log holds 500,000 records,

1. unset ($_session[' xxx ') deletes a single session,unset ($_session[' xxx ')) to unregister a registered session variable. The effect is the same as Session_unregister (). Session_unregister () has been discarded in the PHP5. Unset ($_session)

One of the great benefits of using scripting languages is that you can take advantage of the automatic garbage collection mechanism it has (freeing up memory). You don't need to do any free memory processing after using the variable, PHP will help

The unset () function of PHP is used to clear and destroy variables. unused variables can be destroyed using unset. However, in some cases, the memory occupied by destroying variables cannot be reached with unset! The code is as follows: For ($ I =

Opposite to Constructor, in PHP5, you can define a function named _ destruct (), called PHP5 destructor, PHP will call the destructor before the object is destroyed in the memory, so that the object can complete some work before it completely

An interesting question about php destructor: php functions. An interesting question about php destructor. with the popularity of object-oriented programming, php functions present many interesting questions. I believe that many beginners will learn

Application of CookiesEg8-2.php A simple example of printing the contents of an $_cookie array//eg:8.2 $value= "My Cookie value"; //send a simple cookie Setcookie("TestCookie",$value, Time() +60*60*24*30);?> PHPif(isset($_cookie["TestCookie"]))

Ec (2); we use the unset function to delete the specified array subscript element. Next, let's look at the unset syntax voidunset (mixedvar [, mixedvar [,...]). unset () destroys the specified variable. Note that in php tutorial 3, unset () will

The global variables in PHP are a little different from those in C language. In C language, global variables take effect automatically in the function unless they are overwritten by local variables, which may cause some problems, some may carelessly

To delete an array, you can use the unset function in php or directly set the specified index to null. This can also be deleted. However, after using the two methods, the array element index will be empty, so how to solve this problem. To delete an