PHP Tutorial

💡 PHP Variables

Variables in PHP are used to store data like text, numbers, or other values. They are declared using the $ sign, followed by the variable name.

🔹 Example:

<?php
  $name = "Technorank";
  $age = 20;
  $is_online = true;

  echo "Name: " . $name;
  echo "<br>";
  echo "Age: " . $age;
?>
  

📌 Rules for Variable Names

• Must start with $ followed by a letter or underscore
• Cannot start with a number
• Can only contain letters, numbers, and underscores (A-z, 0-9, _)
• Are case-sensitive ($var and $Var are different)

🧪 Example: Multiple Variables

<?php
  $x = 5;
  $y = 10;
  $sum = $x + $y;

  echo "Sum is: " . $sum;
?>
  

🔄 Variable Output

You can use echo or print to display variables:

<?php
  $greeting = "Hello";
  $name = "Technorank";

  echo $greeting . " " . $name;
?>
  

🛠️ Quick Tips

• Always start variable names with $
• Use meaningful names like $username or $price
• Use comments to describe complex logic