php中$_GET,$_POST,$_REQUEST用法与区别分析
1.$_REQUEST
默认情况下包含了 $_GET,$_POST 和 $_COOKIE 的数组,代码如下:
<?php $_GET['foo'] = 'a'; $_POST['bar'] = 'b'; var_dump($_GET); // Element 'foo' is string(1) "a" var_dump($_POST); // Element 'bar' is string(1) "b" var_dump($_REQUEST); // Does not contain elements 'foo' or 'bar' ?>
注:它的速度比其它的要慢一些
2.$_GET
$_GET 变量用于收集来自 method="get" 的表单中的值,从带有 GET 方法的表单发送的信息,对任何人都是可见的(会显示在浏览器的地址栏),并且对发送的信息量也有限制,最多 100 个字符。
实例代码如下:welcome.php?name=Peter&age=37
welcome.php" 文件现在可以通过 $_GET 变量来获取表单数据了,请注意,表单域的名称会自动成为 $_GET 数组中的 ID 键,代码如下:
Welcome <?php echo $_GET["name"];?> .<br /> You are <?php echo $_GET["age"];?> years old!
注:数据量不能过大最多只能100个字符或2kb
3. $_POST
$_POST 变量是一个数组,内容是由 HTTP POST 方法发送的变量名称和值。
$_POST 变量用于收集来自 method="post" 的表单中的值。从带有 POST 方法的表单发送的信息,对任何人都是不可见的(不会显示在浏览器的地址栏),并且对发送信息的量也没有限制,代码如下:
<form action="welcome.php" method="post"> Enter your name: <input type="text" name="name" /> Enter your age: <input type="text" name="age" /> <input type="submit" /> </form>
selcome.php文件,代码如下:
Welcome <?php echo $_POST["name"];?> .<br /> You are <?php echo $_POST["age"];?> years old!
注:比get要好很多数据处理量大同时大多用于表单,三区别在于$_REQUEST可以获取$_GET和$_post的数据,但是效率相对于前二者是要慢些,为什么慢我想大家用脚指都能想明白的,这里就留下大家思想吧。
教程地址:
欢迎转载!但请带上文章地址^^

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Classification and Usage Analysis of JSP Comments JSP comments are divided into two types: single-line comments: ending with, only a single line of code can be commented. Multi-line comments: starting with /* and ending with */, you can comment multiple lines of code. Single-line comment example Multi-line comment example/**This is a multi-line comment*Can comment on multiple lines of code*/Usage of JSP comments JSP comments can be used to comment JSP code to make it easier to read

WPS is a commonly used office software suite, and the WPS table function is widely used for data processing and calculations. In the WPS table, there is a very useful function, the DATEDIF function, which is used to calculate the time difference between two dates. The DATEDIF function is the abbreviation of the English word DateDifference. Its syntax is as follows: DATEDIF(start_date,end_date,unit) where start_date represents the starting date.

How to use the exit function in C language requires specific code examples. In C language, we often need to terminate the execution of the program early in the program, or exit the program under certain conditions. C language provides the exit() function to implement this function. This article will introduce the usage of exit() function and provide corresponding code examples. The exit() function is a standard library function in C language and is included in the header file. Its function is to terminate the execution of the program, and can take an integer

Introduction to Python functions: usage and examples of the abs function 1. Introduction to the usage of the abs function In Python, the abs function is a built-in function used to calculate the absolute value of a given value. It can accept a numeric argument and return the absolute value of that number. The basic syntax of the abs function is as follows: abs(x) where x is the numerical parameter to calculate the absolute value, which can be an integer or a floating point number. 2. Examples of abs function Below we will show the usage of abs function through some specific examples: Example 1: Calculation

Introduction to Python functions: Usage and examples of the isinstance function Python is a powerful programming language that provides many built-in functions to make programming more convenient and efficient. One of the very useful built-in functions is the isinstance() function. This article will introduce the usage and examples of the isinstance function and provide specific code examples. The isinstance() function is used to determine whether an object is an instance of a specified class or type. The syntax of this function is as follows

The Request object in PHP is an object used to handle HTTP requests sent by the client to the server. Through the Request object, we can obtain the client's request information, such as request method, request header information, request parameters, etc., so as to process and respond to the request. In PHP, you can use global variables such as $_REQUEST, $_GET, $_POST, etc. to obtain requested information, but these variables are not objects, but arrays. In order to process request information more flexibly and conveniently, you can

The ISNULL() function in MySQL is a function used to determine whether a specified expression or column is NULL. It returns a Boolean value, 1 if the expression is NULL, 0 otherwise. The ISNULL() function can be used in the SELECT statement or for conditional judgment in the WHERE clause. 1. The basic syntax of the ISNULL() function: ISNULL(expression) where expression is the expression to determine whether it is NULL or

How to use the urllib.request.urlopen() function in Python3.x to send a GET request. In network programming, we often need to obtain data from a remote server by sending an HTTP request. In Python, we can use the urllib.request.urlopen() function in the urllib module to send an HTTP request and get the response returned by the server. This article will introduce how to use
