Backend Development
PHP Tutorial
The difference between the usage of stripslashes and addslashes in php_PHP tutorial
The difference between the usage of stripslashes and addslashes in php_PHP tutorial
In PHP we often use stripslashes and addslashes. Let me introduce in detail how to use stripslashes and addslashes and the differences between them.
addslashes
The addslashes() function adds a backslash before the specified predefined characters.
These predefined characters are:
•Single quote (')
•Double quotes (")
•Backslash ()
•NULL
In this example, we want to add a backslash to a predefined character in a string:
Note: By default, the PHP instruction magic_quotes_gpc is on, automatically running addslashes() for all GET, POST and COOKIE data. Do not use addslashes() on strings that have been escaped by magic_quotes_gpc, as this will result in double escaping. When encountering this situation, you can use the function get_magic_quotes_gpc() to detect it.
The code is as follows
|
Copy code
|
||||
|
/** * Determine whether to use addslashes() to process * * @param String $str* */function str_addslashes($str, $db_type='mysql') { if(get_magic_quotes_gpc()){ switch($db_type){ case "access":$str = stripslashes($str); $str = str_replace("'","''",$str);
} }else { switch($db_type){ case "mysql":$str = addslashes($str); break;case "access": $str = str_replace("'","''",$str);break; } |
}|||||
Code
The code is as follows| Copy code
|
//Submit data, or prepare variables:
$Content=addslashes("This is data, whether there are single quotes or variables");
//Insert data into the database, code omitted
//Start displaying data
$Content="Data read from database";
if(get_magic_quotes_gpc()){
$Content=stripslashes($Content);
}
echo $Content;
Summary of differences
When magic_quotes_gpc = On, the data processed using addslashes() will be saved in the database in the form of '. If you output it directly at this time, you will find that there are more contents than you expected, so stripslashes() appears, it can be removed (different from str_replace("", "",$Str)).
When magic_quotes_gpc = Off, the data processed using addslashes() will be saved in the database in the form of '. There is no problem mentioned above. addslashes() plays the role of inserting data without errors. If at this time If output directly, the data is normal. No need to use stripslashes() anymore.
addslashes() and stripslashes() are exactly the opposite. Direct memory: addslashes() adds one, stripslashes() removes one
http://www.bkjia.com/PHPjc/628898.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/628898.htmlTechArticleWe often use stripslashes and addslashes in php. Let me introduce in detail how to use stripslashes and addslashes. The difference between them. addslashes addslashes() function...
|
|
|
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
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
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
The Future of PHP: Adaptations and Innovations
Apr 11, 2025 am 12:01 AM
The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP's Current Status: A Look at Web Development Trends
Apr 13, 2025 am 12:20 AM
PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP's Purpose: Building Dynamic Websites
Apr 15, 2025 am 12:18 AM
PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.
PHP vs. Python: Core Features and Functionality
Apr 13, 2025 am 12:16 AM
PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
