法国《电影手册》眼中的2016“年度十佳影片”
Key ways to prevent SQL injection in PHP include: 1. Use preprocessing statements (such as PDO or MySQLi) to separate SQL code and data; 2. Turn off simulated preprocessing mode to ensure true preprocessing; 3. Filter and verify user input, such as using is_numeric() and filter_var(); 4. Avoid directly splicing SQL strings and use parameter binding instead; 5. Turn off error display in the production environment and record error logs. These measures comprehensively prevent SQL injection risks in terms of mechanisms and details.
The key to preventing SQL injection in PHP is to handle user input correctly and use a secure database operation method . Don’t think that filtering a few keywords can be done. Real and effective protection needs to start from the source and mechanism.
Use Prepared Statements
This is the most recommended method at present. Preprocessing statements can separate SQL code from data, fundamentally preventing injection.
- If you are using MySQL, it is recommended to use PDO or MySQLi , both of which support preprocessing.
- Example (taking PDO as an example):
$stmt = $pdo->prepare('SELECT * FROM users WHERE email = ?'); $stmt->execute([$email]); $user = $stmt->fetch();
In this way, even if $email is malicious input, it will be processed as a normal string and will not affect the SQL structure.
Note: Be sure to turn off the "Simulation Preprocessing" mode to ensure that preprocessing is actually used:
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
Filter and verify user input
Although preprocessing is already very powerful, it is still necessary to conduct basic checks on user input.
- For fields of numeric types, use
is_numeric()or cast; - For formats such as mailbox, URL, etc., you can use
filter_var()function; - For example, verify the email:
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { // The email address is illegal, refuse to process}
This not only prevents injection, but also improves program robustness and reduces invalid requests.
Avoid splicing of SQL strings
A common mistake for beginners is to splice variables directly into SQL, such as:
$sql = "SELECT * FROM users WHERE id = " . $_GET['id'];
This writing method is extremely risky. Even if you do filtering, it will be difficult to cover all situations. Parameter binding should always be used instead of string stitching.
Do not expose error messages to the front end
During development, we like to turn on error prompts for easy debugging, but we must turn it off in production environment:
ini_set('display_errors', 0);
Otherwise, the attacker can understand your database structure by reporting an error message, thereby conducting more accurate attacks.
It is also recommended to log error logs instead of outputting them directly:
error_reporting(E_ALL); ini_set('log_errors', 1); ini_set('error_log', '/path/to/error.log');
Basically that's it. SQL injection is not a profound attack method, but many vulnerabilities are caused by neglecting details. As long as you develop good habits in development, you can effectively avoid such problems.
The above is the detailed content of How to prevent SQL injection in PHP. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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)
How to use PHP to build social sharing functions PHP sharing interface integration practice
Jul 25, 2025 pm 08:51 PM
The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.
PHP calls AI intelligent voice assistant PHP voice interaction system construction
Jul 25, 2025 pm 08:45 PM
User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.
How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization
Jul 25, 2025 pm 08:57 PM
To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X
PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy
Jul 25, 2025 pm 08:27 PM
1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.
PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism
Jul 25, 2025 pm 08:30 PM
PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.
How to use PHP to combine AI to generate image. PHP automatically generates art works
Jul 25, 2025 pm 07:21 PM
PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.
Beyond the LAMP Stack: PHP's Role in Modern Enterprise Architecture
Jul 27, 2025 am 04:31 AM
PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway
PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution
Jul 25, 2025 pm 07:06 PM
Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.
