Prepared Statements
Secure your database queries with prepared statements.
Prepared Statements is a free PHP Academy lesson on CoddyKit — lesson 5 of 6. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the PHP Academy learning path, one of 6 lessons in the course, and your progress syncs across the web and the CoddyKit app.
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Prepared Statements
Welcome to the next lesson! In this lesson, you’ll learn about prepared statements and how they make your database interactions secure and efficient. Let’s get started!
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What Are Prepared Statements?
Prepared statements are a feature of database management systems that allow you to execute SQL queries securely and efficiently. They separate SQL code from data, preventing SQL injection attacks.
Example: Using placeholders (:name, :email) instead of embedding user input directly into the query.
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Why Use Prepared Statements?
Prepared statements offer several benefits:
- Security: Prevent SQL injection by escaping user inputs.
- Efficiency: Reuse the same statement with different data, reducing query parsing time.
- Maintainability: Make your code easier to read and debug.
Key Point: Always use prepared statements when interacting with user-provided data.
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Creating a Prepared Statement
To create a prepared statement, follow these steps:
- Write the SQL query with placeholders.
- Prepare the query using the database connection.
- Bind values to the placeholders.
- Execute the statement.
Example:
Tip: Use associative arrays to bind values easily.
<?php
$sql = "INSERT INTO users (name, email) VALUES (:name, :email)";
$stmt = $pdo->prepare($sql);
$stmt->execute(["name" => "Alice", "email" => "alice@mail.com"]);
?>5
Binding Values
Use the bindParam() or bindValue() methods to bind values to placeholders. Example:
<?php
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(":name", $name);
$stmt->bindParam(":email", $email);
$name = "Bob";
$email = "bob@mail.com";
$stmt->execute();
?>
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Using Prepared Statements for SELECT Queries
Prepared statements work with all types of SQL queries, including SELECT. Example:
Tip: Use fetchAll() to retrieve multiple rows.
<?php
$sql = "SELECT * FROM users WHERE name = :name";
$stmt = $pdo->prepare($sql);
$stmt->execute(["name" => "Alice"]);
$result = $stmt->fetch(PDO::FETCH_ASSOC);
echo "Name: " . $result["name"] . ", Email: " . $result["email"];
?>
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Reusing Prepared Statements
Prepared statements can be reused with different values, improving efficiency. Example:
<?php
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$users = [
["name" => "Charlie", "email" => "charlie@mail.com"],
["name" => "Dave", "email" => "dave@mail.com"]
];
foreach ($users as $user) {
$stmt->execute($user);
}
echo "Multiple records inserted successfully!";
?>
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Preventing SQL Injection
Prepared statements escape special characters in user inputs, preventing SQL injection attacks. Example:
<?php
$sql = "SELECT * FROM users WHERE email = :email";
$stmt = $pdo->prepare($sql);
$stmt->execute(["email" => "' OR 1=1; --"]);
$result = $stmt->fetch();
if ($result) {
echo "User found.";
} else {
echo "No user found.";
}
?>
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Great Job!
Congratulations! You’ve learned how to use prepared statements in PHP to secure your database interactions. In the next lesson, we’ll explore advanced querying techniques with JOINs and aggregations. Let’s keep coding!
Frequently asked questions
Is the “Prepared Statements” lesson free?
Yes — the full text of “Prepared Statements” is free to read here on the web, and the PHP Academy course includes 6 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the PHP Academy course, upgrade to CoddyKit PRO.
What will I learn in “Prepared Statements”?
Secure your database queries with prepared statements. You practise PHP Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start PHP Academy?
No prior experience is required. PHP Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 5 of 6, so you can start here or from the beginning and move at your own pace.
How long does the “Prepared Statements” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this PHP Academy lesson?
Yes. Every PHP Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.