Lesson 3: Basic Syntax and PHP Tags

3.1 PHP echo and print

• • • • • Outputs one or more strings.
        • Example:
        <?php
        echo("Hello World!");
        ?>

• print:
  • • Outputs a string and returns a value (1 for success).
    • Example:
    <?php
    print “Hello, PHP!”;
    ?>

3.2 Comments in PHP

• • Single-line comments:

• • Multi-line comments:

3.3 Variables and Data Types

• Variables:
  • • Start with $ and are case-sensitive.
    • Example:
  <?php
  $name = “John”;
  echo $name; // Outputs: John
  ?>
• Data Types:
  1. 1. String: Text data. Example: "Hello"
     2. Integer: Whole numbers. Example: 42
     3. Float: Decimal numbers. Example: 3.14
     4. Boolean: true or false.
     5. Array: Collection of values. Example:
  <?php
  $colors = array(“Red”, “Green”, “Blue”);
  ?>
  1. Object: Instances of classes.
  2. NULL: Represents no value.
  3. Resource: Special data type for file and database handlers.

Example: Combining Concepts

Activities and Exercises

1. Quiz: Multiple-choice questions on PHP basics and features.
2. Assignment: Create a PHP file that displays a short introduction about yourself, including your name, age, and hobbies.
3. Hands-On:
   • Create a script that calculates the area of a rectangle.
   • Write a script that outputs the current date and time using the date() function.