PHP

When to Use

• Server-side web development
• WordPress / CMS development
• Content-heavy sites
• Rapid prototyping

Quick Start

<?php
$name = "World";
echo "Hello, $name!";

$colors = ["red", "green", "blue"];
foreach ($colors as $color) {
    echo $color . "<br>";
}
?>

Core Concepts

Arrays

$user = [
    "id" => 1,
    "name" => "Foo"
];

Superglobals

$_GET

$_POST

$_SESSION

OOP

Best Practices

• Use Composer for dependency management
• Type hint function arguments and return types
• Use PDO for database access (prepared statements)
• Follow PSR standards (PSR-12)

• Use

  mysql_

  functions (deprecated/removed)
• Trust user input (sanitize/validate)
• leave

  display_errors

  on in production

References

• PHP.net
• PHP The Right Way