PHP Programming

  1. Security Best Practices
    1. Input Validation and Sanitization
      1. Validation Principles
        1. Server-Side Validation
          1. Data Type Validation
            1. Range and Length Validation
              1. Format Validation
                1. Whitelist vs Blacklist Approaches
                2. Output Escaping
                  1. Context-Aware Escaping
                    1. HTML Escaping
                      1. htmlspecialchars() Function
                        1. htmlentities() Function
                        2. JavaScript Escaping
                          1. URL Escaping
                            1. CSS Escaping
                            2. Cross-Site Scripting (XSS) Prevention
                              1. XSS Attack Types
                                1. Stored XSS
                                  1. Reflected XSS
                                    1. DOM-based XSS
                                    2. XSS Prevention Techniques
                                      1. Content Security Policy
                                        1. Input Filtering
                                        2. Cross-Site Request Forgery (CSRF) Prevention
                                          1. CSRF Attack Mechanics
                                            1. CSRF Token Implementation
                                              1. Token Validation
                                              2. SQL Injection Prevention
                                                1. SQL Injection Attack Types
                                                  1. Prepared Statements
                                                    1. Parameter Binding
                                                      1. Input Validation
                                                        1. Least Privilege Principle
                                                        2. Authentication and Authorization
                                                          1. Password Security
                                                            1. Password Hashing
                                                              1. password_hash() Function
                                                                1. Password Verification
                                                                  1. password_verify() Function
                                                                    1. Password Rehashing
                                                                      1. Salt Generation
                                                                      2. Session Security
                                                                        1. Session ID Security
                                                                          1. Session Regeneration
                                                                            1. Session Timeout
                                                                              1. Secure Session Configuration
                                                                              2. Access Control
                                                                                1. Role-Based Access Control
                                                                                  1. Permission Systems
                                                                                    1. Authorization Checks
                                                                                  2. File Security
                                                                                    1. File Upload Security
                                                                                      1. File Type Validation
                                                                                        1. File Size Limits
                                                                                          1. Upload Directory Security
                                                                                            1. File Execution Prevention
                                                                                            2. File System Security
                                                                                              1. Path Traversal Prevention
                                                                                                1. File Permission Management
                                                                                                  1. Secure File Storage
                                                                                                2. Communication Security
                                                                                                  1. HTTPS Implementation
                                                                                                    1. SSL/TLS Configuration
                                                                                                      1. Certificate Management
                                                                                                        1. Secure Headers
                                                                                                          1. X-Frame-Options
                                                                                                            1. X-XSS-Protection
                                                                                                              1. X-Content-Type-Options

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                                                                                                          10. Error Handling and Debugging

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                                                                                                          12. Modern PHP Development