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PHP Variables

  • Programming
  • 20 May 2022
  • 303 Views
  • Sathiyamoorthy V

Variables are "containers" for storing information

Creating (Declaring) PHP Variables

In PHP, a variable starts with the $ sign, followed by the name of the variable

Example

<?php
$txt = "Hello world!";
$x = 5;
$y = 10.5;
?>

Output

Hello world!
5
10.5

After the execution of the statements above, the variable $txt will hold the value Hello world! , the variable $x will hold the value 5 , and the variable $y will hold the value 10.5.

Note: When you assign a text value to a variable, put quotes around the value.

Note: Unlike other programming languages, PHP has no command for declaring a variable. It is created the moment you first assign a value to it.

Think of variables as containers for storing data.

PHP Variables

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume)

Rules for PHP variables:

1. A variable starts with the $ sign, followed by the name of the variable

2. A variable name must start with a letter or the underscore character

3. A variable name cannot start with a number

4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

5. Variable names are case-sensitive ($age and $AGE are two different variables)

Remember that PHP variable names are case-sensitive!

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PHP Variables
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