Php Isset Tutorial

A variable in PHP is a program defined representation for a value which has a set scope or area of the program it can 'live' and be recognized or used. PHP has some conventions for naming variables which must be kept in mind:

• A variable name must begin with a dollar sign and can contain only alpha-numeric characters and/or an underscore.
• Variables are case sensitive so the variable $myvar is considered a different variable than $MyVar to the PHP system.
• A variable name should describe its use and make sense to the reader.
• A variable (i.e. or any other PHP program entities), cannot be named the same as any of the PHP reserved words.

A variable does not need to be declared before adding a value to it because the PHP language is not strongly typed. Additionally, Since PHP is loosely typed, the variable type is not declared. The newly created variable will take the data type of the any value assigned it.

The data and thus the implied type can also be changed at any time after creation by filling it with a different 'typed' value. Initializing a variable in PHP is performed by naming it and filling it with data or null value: The variable will however take a value of false, empty string or empty array so it should always be initialized upon creation. PHP will allow the programmer to embed variables inside of strings and PHP will perform the string replacements for the programmer:

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