variables.md

Variables

• Variables are named containers for holding data

Variable Naming Conventions

- PHP variables start with $
- Variable names are case sensitive
- A valid variable name starts with a letter or underscore
- A variable can't start with a number
- A variable can only contain alpha-numeric charachters and underscores

$variable
$thisIsAVariable
$variable2
$this_works_aswell

Assigning a value is similiar to other languages

$fName = "Taichen"; //string
$favNumber = 25; //int
$price = 4.99; //float
$skyIsBlue = True; //boolean

• You can reassign a variable at any time
• You can assign a variable to another variable

$food = "Spaghetti";

echo $food; //Output: Spaghetti

$food = "Pizza";

echo $food; //Output: Pizza

$drink = "Lemonade";
$drink2 = $drink;

echo $drink; // Output: Lemonade
echo $drink2; //Output: Lemonade

Retrieving a Value

$fName = "Taichen";

echo "Hi " . $fName; //Outputs: Hi Taichen

$number = 35;
$price = 2.99;

echo "I just bought " . $number . " cakes for $" . $price ". What a deal!";
//Above output: I just bought 35 cakes for $2.99. What a deal!