Variables are "containers" for storing information
In PHP, a variable starts with the $
sign, followed by the name of the variable
<?php
$txt = "Hello world!";
$x = 5;
$y = 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.
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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