PHP variables - Wikipedia

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'<?php $txt=”Hello World!”; $x=16; ?>

PHP is a Loosely Typed Language

In PHP, a variable does not need to be declared before adding a value to it.

In the example above, you see that you do not have to tell PHP which data type the variable is.

PHP automatically converts the variable to the correct data type, depending on its value.

In a strongly typed programming language, like C,C++,Java etc you have to declare (define) the type and name of the variable before using it.

In PHP, the variable is declared automatically when you use it.