Introduction to PHP Basics: Syntax, Variables, Operators, Control Structures, Functions, and More

PHP is a powerful server‑side scripting language with a simple syntax and a gentle learning curve, making it an excellent choice for beginners entering web development.

PHP code must be placed between the <?php and ?> tags, for example:

<?php
  // PHP code
?>

Variables are defined with the $ symbol and are case‑sensitive. PHP supports several data types, including strings (e.g., $name = "John Doe"; ), integers (e.g., $age = 25; ), floats (e.g., $price = 19.99; ), booleans ( true or false ), arrays (e.g., $colors = array("red", "green", "blue"); ), objects (e.g., $user = new User(); ), and NULL (e.g., $address = NULL; ).

PHP supports a variety of operators: arithmetic ( +, -, *, /, % ), assignment ( =, +=, -=, *=, /=, %= ), comparison ( ==, !=, >, <, >=, <= ), and logical ( &&, ||, ! ).

Control structures include conditional statements ( if , else , elseif , switch ) and loops ( for , while , do...while , foreach ), each demonstrated with typical syntax examples.

Functions are reusable code blocks defined with the function keyword. Example:

function greet($name) {
  echo "Hello, $name!";
}

greet("John"); // outputs: Hello, John!

Common array functions include count() , array_push() , array_pop() , array_merge() , and array_search() . String functions such as strlen() , strpos() , substr() , str_replace() , strtolower() , and strtoupper() are also provided.

File inclusion is achieved with include or require statements, for example:

include 'header.php';
require 'footer.php';

In summary, the article offers a brief overview of PHP's basic syntax and core features, laying the groundwork for further study of more advanced concepts.