PHP Variables
Variables are "containers" for storing information.
Variable is just like "container" which is used to store Value or Information
Creating (Declaring) PHP Variables
A variable starts with the $ sign, followed by the name of the variable:
Example
<?php
$txt = "Hello world!";
$x = 5;
$y = 10.5;
echo $txt;<br>
echo $x;<br>
echo $y;<br>
?>
$txt = "Hello world!";
$x = 5;
$y = 10.5;
echo $txt;<br>
echo $x;<br>
echo $y;<br>
?>
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.
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.
Rules for PHP variables:
- A variable starts with the $ sign, followed by the name of the variable
- A variable name must start with a letter or the underscore character
- A variable name cannot start with a number
- A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
- Variable names are case-sensitive ($age and $AGE are two different variables)
Output Variables
The PHP echo statement is often used to output data to the screen.
The following example will show how to output text and a variable: