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Free Beginner PHP Tutorials - Variables | Whats-online.info

Free Beginner PHP Tutorials - Variables

2016/08/26 / Science and Tutorials

Learn how to handle variables in PHP. See example:-

PHP Variables

Variable is defined as a symbol or name that stores information.Variables are used for storing values such as numeric values, characters, character strings, or memory addresses.

Creating  PHP Variables

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

For example:

<?PHP     $val="Hello world";    echo $val; ?>

$val is a variable that stores the string Hello World. Unlike other programming languages, in PHP, the data type of the variable is not specified whether it is an integer, double or a string.
For example, in Java,c,c++, we declare variables starting with the data type.

String val="Hello world";

Rules for PHP variables:

1. A variable in PHP must start with the $ sign, followed by the name of the variable. For example ($val)
2. A variable name must begin with a letter or the underscore character. For example, ($val or $_val)
3. A variable name cannot start with a number. For example, ( $23 ) not allowed
4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ). Special characters (/, *, &, #)  are not permitted in PHP.
5. Variable names are case-sensitive ($val and $VAL are two different variables).
6.A variable cannot contain spaces

Output Variables

Variables in PHP are outputted using the echo statement as shown below.

<?php        $val="Hello World";           echo "Welcome ".$val." Thankyou"; ?>

The following example will output: Welcome Hello World Thankyou.

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