Syntax and Variables in PHP: A Guide to PHP Syntax and Variables

PHP is a powerful and flexible server-side programming language widely used for developing dynamic web applications. In this article, we will explore the syntax and variables in PHP.

PHP Syntax

PHP code is written inside opening and closing tags '<?php' and '?>'.

Any PHP code written between these tags will be executed on the server.

PHP statements end with a semicolon (;).


Variables in PHP

In PHP, variables are used to store and reference values.

A variable is declared using the dollar sign ($) followed by the variable name.

PHP variables do not need to be declared with a data type; they automatically infer the data type based on the value assigned to the variable.

Example: $name = "John"; $age = 25;


Data Types of Variables in PHP

PHP supports various data types such as integer, float, string, boolean, array, object, null, and resource.

Data types can be determined using functions like gettype() or checked using functions like is_int(), is_string(), etc.


Naming Conventions for Variables in PHP

Variable names can contain letters, numbers, and underscores (_), but must start with a letter or underscore.

Variable names are case-sensitive (PHP is case-sensitive).

Variable names cannot contain special characters such as spaces, dots, special characters, etc.

Example: $myVariable, $number_1, $userName.


These are some basic concepts of syntax and variables in PHP. These concepts are essential to understand and utilize while programming in PHP.