- Application Security
- Database Sanitization
- Encryption
- RESTful Sanitization
- Sessions and Cookies
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- Communication Functions
- CLI Web Server
- Filesystem Access
- HTTP
- Mail
- Sockets
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- Databases
- Connection Management
- Database Usage
- SQL
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- Language Functions
- Arrays
- Date and Time
- Exceptions
- Perl-Compatible Regular Expressions
- Strings
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- Language Structure
- Control Structures
- Functions
- Math and Logic Operators
- Namespaces
- Variables and Constants
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- Object Oriented Programming
- Classes
- Magic Methods
- Objects
- Relationships
- Traits
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- XHTML Integration
- Form Processing
- Images
- JSON
- Text Output
- XML
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