Here's a comprehensive PHP cheat sheet covering essential syntax and functions:

Basics

Data Types

• String: "Hello, World!"
• Integer: 123
• Float: 12.34
• Boolean: true or false
• Array: ["apple", "banana", "cherry"]
• Object
• NULL

Strings

Arrays

 "value1", "key2" => "value2"];

// Array functions
count($array);                  // Count elements
array_push($array, 4);          // Add an element
array_merge($array, [4, 5]);    // Merge arrays
in_array(2, $array);            // Check if element exists
?>

Control Structures

If-Else

Switch

Loops

Functions

Superglobals

• $_GET – Variables sent via URL parameters
• $_POST – Variables sent via HTTP POST
• $_REQUEST – Variables sent via both GET and POST
• $_SERVER – Server and execution environment information
• $_SESSION – Session variables
• $_COOKIE – HTTP Cookies

File Handling

Error Handling

getMessage();
} finally {
    // Code to always execute
}
?>

Database (MySQLi)

connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Select data
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "
";
    }
} else {
    echo "0 results";
}

$conn->close();
?>

Session Management

Include & Require

This cheat sheet covers the fundamental concepts and commonly used features in PHP. Let me know if you need more details on any specific topic!