Backend DevelopmentPHP TutorialDetailed examples of usage and differences between $_POST and $_GET in PHPDetailed examples of usage and differences between $_POST and $_GET in PHP
post and get refer to the two methods of page submission.
(Recommended tutorial: php practical video tutorial)
get: The parameters are reflected in the url, which can be used for page turning and simple query. get can only receive 2M The following content has limitations. In addition, because the content is visible, security is reduced.
post: used for page form submission and file upload. There is no size limit and it will not show up on the address bar.
$_POST variable
$_POST variable is an array containing the variable names and values sent by the HTTP POST method.
$_POST variable is used to collect values from the form with method="post".
The information sent from the form with the POST method is invisible to anyone (will not be displayed in the browser's address bar), and there is no limit on the amount of information sent.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<form action="http://127.0.0.1:8080/php7/hello.php" method="post">
Enter your name: <input type="text" name="name" />
Enter your age: <input type="text" name="age" />
<input type="submit" />
</form>
</body>
</html>Here is the code for the hello.php file. The "hello.php" file can now obtain form data through the $_POST variable (please note that the name of the form field will automatically Becomes the ID key in the $_POST array)
<?php
header("content-type:text/html;charset=utf-8");
echo $_POST["name"];
//可以输出form中标签的属性值 其中参数的name
echo $_POST["age"];
?>Why use $_POST?
Variables sent via HTTP POST will not appear in the URL.
There is no length limit for variables.
However, since the variable does not appear in the URL, the page cannot be bookmarked.
$_GET variable
$_GET variable is used to collect values from the form with method="get", which can be seen intuitively in the browser Parameters, for example, when I search for "wordpress" on Baidu, the URL I request is http://www.baidu.com/s?ie=utf-8&bs=wordpress&f=8&rsv_bp=1&wd=wordpress&inputT=0, then '?' The following parameters can be obtained using $_GET, and each parameter is separated by '&'.
$_GET variable is an array containing variable names and values sent by the HTTP GET method.
The information sent from the form with the GET method is visible to anyone (will be displayed in the browser's address bar), and there is a limit on the amount of information sent (up to 100 characters), Therefore, the length of the parameters is not infinite, but it can basically meet our requirements.
Example:
<form action="hello.php" method="get"> Name: <input type="text" name="name" /> Age: <input type="text" name="age" /> <input type="submit" /></form>
When the user clicks the submit button, the URL sent will be similar to this:
http://www.w3school.com.cn/welcome.php?name=Peter&age=37
The "hello.php" file can now be obtained through the $_GET variable form data (please note that the name of the form field will automatically become the ID key in the $_GET array)
Welcome <?php echo $_GET["name"]; ?>.<br /> You are <?php echo $_GET["age"]; ?> years old!
If you enter Mike in the name form box and enter 23 in the age form box, then The result displayed is like this.
Welcome Mike You are 23 years old!
Why use $_GET?
Note: When using the $_GET variable, all variable names and values will be displayed in the URL. So this method should not be used when sending passwords or other sensitive information.
However, because the variables appear in the URL, you can bookmark the page in your favorites. In some cases this is useful.
Note: The HTTP GET method is not suitable for large variable values; the value cannot exceed 100 characters.
The above is the detailed content of Detailed examples of usage and differences between $_POST and $_GET in PHP. For more information, please follow other related articles on the PHP Chinese website!
The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AMWhat’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.
PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AMPHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.
PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AMPHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AMPHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.
Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AMPHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AMPHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.
PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AMPHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AMPHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
