PHP Basics Questions

English Version : 

PHP stands for Hypertext Preprocessor.

PHP is a server-side scripting language used to create dynamic web pages. PHP runs on the server, not in the browser.

What does Server-Side mean?

PHP does not run in the browser. It runs on the server 

Complete Flow: 

1. The user enters a URL in the browser example.com/index.php
   
2. The request goes to the web server.
   
3. The server detects a .php file and sends it to the PHP interpreter
   
4. PHP executes the code: 
   

   • Fetches data from the database

   • Runs business logic

   • Generates HTML output
     
5. The server sends only the final HTML to the browser.
   

Note: The PHP code is never visible in the browser

Hindi version : 

PHP (Full form of PHP Hypertext Preprocessor) एक Server-side scripting language है |जो Dynamic web pages बनाने के लिए use होती है।

Dynamic का मतलब: हर user को अलग-अलग data दिख सकता है (Database से data लेकर  user को website में दिखाई देता हैं)

Server-side का मतलब:

PHP browser में नहीं चलती, ये server पर चलती है|

Step by Step पूरा flow समझो:

1. User browser में URL डालता है example.com/index.php

2. Request server पर जाती है (Apache/Nginx)

3. Server PHP को execute करता है

4. PHP कैसे execute होती है : 

   • Database से data लाती है 

   • Logic run करती है

   • HTML बनाती है

Browser को सिर्फ final HTML output मिलता है

Note : PHP code कभी browser में नहीं दिखता

PHP stands for Hypertext Preprocessor (originally Personal Home Page). It is a widely-used open-source server-side scripting language that is especially suited for web development.

Key characteristics:

• Server-side execution
• Embedded in HTML
• Cross-platform compatibility
• Supports multiple databases
• Large community and ecosystem

Both echo and print are used to output data in PHP, but they have subtle differences:

• echo: Can take multiple parameters (comma-separated), does not return a value, slightly faster
• print: Takes only one argument, always returns 1, can be used in expressions

echo "Hello", " World"; // Works
print "Hello World";     // Works
$result = print "test";  // $result is 1

These are comparison operators with different strictness levels:

• == (Loose comparison): Compares values after type juggling. "5" == 5 is true
• === (Strict comparison): Compares both value AND type. "5" === 5 is false

Best practice: Always use === to avoid type coercion bugs.

var_dump(0 == "foo");   // true (PHP 7) – Dangerous!
var_dump(0 === "foo");  // false – Safe!