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Questions and Answers
What does PHP stand for?
What does PHP stand for?
When was the first version of PHP, named PHP/FI, released?
When was the first version of PHP, named PHP/FI, released?
Which feature of PHP makes it suitable for building database-driven web applications?
Which feature of PHP makes it suitable for building database-driven web applications?
What purpose does JavaScript serve in web development compared to PHP?
What purpose does JavaScript serve in web development compared to PHP?
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Which operating systems can PHP run on?
Which operating systems can PHP run on?
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What type of scripting language is PHP categorized as?
What type of scripting language is PHP categorized as?
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How does PHP differ from JavaScript in terms of content manipulation?
How does PHP differ from JavaScript in terms of content manipulation?
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How are PHP and JavaScript primarily used differently?
How are PHP and JavaScript primarily used differently?
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Which of the following frameworks is NOT a popular PHP framework?
Which of the following frameworks is NOT a popular PHP framework?
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How can PHP connect to a MySQL database?
How can PHP connect to a MySQL database?
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What is the correct syntax to embed PHP code within HTML?
What is the correct syntax to embed PHP code within HTML?
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Why is the dollar sign ($) used in PHP variables?
Why is the dollar sign ($) used in PHP variables?
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Study Notes
What is PHP?
- PHP stands for Hypertext Preprocessor, a server-side scripting language used for web development and as a general-purpose programming language.
- PHP code is executed on the server, generating HTML that is sent to the client's web browser.
History of PHP
- PHP was created by Danish-Canadian programmer Rasmus Lerdorf in 1994.
- The first version of PHP, named PHP/FI (Personal Home Page/Forms Interpreter), was released in 1995.
Key Features of PHP
- Open Source: PHP is freely available and actively maintained by a vast community of developers.
- Cross-platform Compatibility: PHP runs on various operating systems like Windows, Linux, macOS, etc.
- Server-side Scripting: PHP scripts are executed on the server, producing dynamic content that can be sent to the client's browser.
- Database Integration: PHP supports integration with various databases like MySQL, PostgreSQL, SQLite, etc.
- Extensive Library Support: PHP offers a rich set of built-in functions and extensions for various tasks such as string manipulation, file handling, networking, and more.
Difference between PHP and Client-side Scripting Languages
- PHP is executed on the server, whereas JavaScript runs on the client's browser.
- PHP generates dynamic content on the server before sending it to the client, while JavaScript manipulates the content already rendered in the browser.
- PHP is primarily used for server-side processing and interacting with databases, while JavaScript is used for client-side interactivity and validation.
PHP Frameworks
- Laravel, Symfony, CodeIgniter, Yii, and Zend Framework are popular PHP frameworks.
- These frameworks provide pre-built modules and libraries to streamline the development process, improve code organization, and enhance security.
Connecting PHP with a Database
- PHP can connect to various databases using database-specific extensions or APIs.
- For example, to connect to a MySQL database, you can use the mysqli or PDO extension in PHP.
Embedding PHP Code within HTML
- PHP code is embedded within HTML using special delimiters: <?php ?>
- For example: <?php echo "Hello, World!"; ?>
PHP Variables
- A variable in PHP is a placeholder for storing data values.
- Variables are preceded by a dollar sign ($) followed by the variable name.
- PHP variables are case-sensitive and must begin with a letter or underscore, followed by letters, numbers, or underscores.
PHP Data Types
- Integer: Represents whole numbers, both positive and negative, without decimal points.
- Float (or Double): Represents numbers with decimal points or numbers in exponential form.
- String: Represents sequences of characters, such as text.
- Boolean: Represents either true or false.
- Array: Represents a collection of key-value pairs or an ordered list of values.
- Object: Represents instances of classes, allowing for object-oriented programming.
- NULL: Represents a variable with no value.
PHP Comments
- Single-line comments: Single-line comments start with // and extend to the end of the line.
- Multi-line comments: Multi-line comments start with /* and */ and can span multiple lines.
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Description
Learn about the basics of PHP, including its meaning, usage, and history. Explore how PHP works as a server-side scripting language for web development.
