unset function

In php, Session is often used to verify user registration or post-login authentication. next I will summarize some common examples and usage of session variables. when you run an application, you will open it, make some changes, and then close it.

PHP magic method summary. 1. the _ get and _ set methods are designed for classes and their parent classes without declared attributes. _ get ($ property) access this method when an undefined property is called _ set ($ p 1. _ get, _ set These two

The elements in the array have their own IDs, so they can be easily accessed; the associated array, each of its ID keys are associated with a value; this article will introduce 10 PHP-related array operations and help you improve development

PHP can delete specific elements in an array. Method 1: Copy the code as follows :? Php $ arr1array (1, 3, 5, 7, 8); $ keyarray_search (3, $ arr1); if ($ key! False) array_splice ($ arr1, $ key, 1); var_dump ($ arr1 );? Output: Method 1: The code

This article provides a detailed analysis of the magic methods in PHP5. For more information, see This article provides a detailed analysis of the magic methods in PHP5. For more information, see In PHP versions later than PHP 5, classes in

In the process of using PHP for development, or early or late, you will need to create many similar variables, and you can store the data as an element in an array. Elements in the array have their own IDs, so they can be easily

The following are examples of use: Copy CodeThe code is as follows: Echo memory_get_usage (), ' '; 313864 $tmp = str_repeat (' http://www.nowamagic.net/', 4000); Echo memory_get_usage (), ' '; 406048 Unset ($TMP); Echo Memory_get_usage (); 313952 ?

Copy CodeThe code is as follows: for ($i = 1; $i $str = str_repeat (' 01234567 ', $i); $a = Memory_get_usage (); Unset ($STR); $b = Memory_get_usage (); echo "\ n ". $i. ': '. ($b-$a). ' Bytes. '; } As seen from the results: 8 x 32 = 256 It is

what is an array? You will need to create many similar variables in the process of using PHP for development, either early or late. Without a lot of similar variables, you can store the data in an array as an element. Elements in the array have

PHP source code reading: the empty and isset functions have recently been asked how to judge the variables when the empty and isset functions are in PHP. at first, I was overwhelmed, because I was just a bit confused, in order to understand its true

PHP development experience 1. solid basic PHP knowledge, functions, constants, etc. try to use built-in methods to solve the problem (because personal writing is often less efficient than built-in methods ); II. implement as few functions as

A friend said that these two are actually the difference between the wording, the following I would like to show you about the difference between global and $globals, the need for a friend can be specific reference. According to the official

PHP pre-defined variables (ii) Session variable ($_session): The data generated by the session function of PHP are stored in the $_session variable in the way of super global variables. 1. Session Introduction The session is also known as the

Analysis of the 10 most common mistakes in PHP programming 10 Currently learning PHP a lot of friends, in peacetime daily program development project always encounter a variety of problems, this experience will introduce PHP development in the 10

Introduction We have never manually opened the process of PHP, it is running with Apache boot, PHP through the mod_php5.so module and Apache connected (specifically, SAPI, the server Application programming interface); PHP has a total of three

From PHP 5 onwards, classes in PHP can use the Magic method. 　　The rules that begin with two underscores (__) are preserved as magic methods, so it is recommended that you do not start with the function name unless you are trying to reload the

PHPsession session processing function, session. PHPsession session handler. when you run an application, you can open it, make some changes, and close it. This is like a session. Computer PHP session processing function, session PHP Session

PHP variable reference puzzles I thought I was already very clear about the variable reference and assignment. The result encountered the following problem, which completely overturned my understanding. After $ s is output, it is still

PHP associated array usage skills that everyone should master ,. You should master the PHP associated array usage skills. during PHP development, you will need to create many similar variables either early or late, at this time, you can use the PHP

Tianya has recently used its free time to read the manual completely, and has published some things that we think are easy to ignore in the blog. Not to mention, article 1. Tianya has recently used its free time to read the manual completely, and