Mixing PHP and HTML
- Mistake: Excessive mixing of PHP and HTML leads to code complexity and maintenance challenges.
// Mistaken code
<h1>Welcome, <?php echo $_SESSION['username']; ?>!</h1>
- Correction: Adopt separation of concerns principles using MVC architecture or template engines like Twig for clearer code organization.
Syntax:
// In a separate file, e.g., welcome.php
<h1>Welcome,
<?php echo $username; ?>!</h1>
Example
Example 1: Prepared Statements
$stmt = $pdo->prepare("SELECT * FROM users WHERE username=? AND password=?");
$stmt->execute([$username, $password]);
Example 2: Error Handling
try {
$stmt = $pdo->prepare("SELECT * FROM users");
$stmt->execute();
} catch (PDOException $e) {
die("Error executing query: " . $e->getMessage());
}
Example 3: Password Hashing
$options = ['cost' => 12];
$hashedPassword = password_hash($password, PASSWORD_BCRYPT, $options);
Example 4: Input Validation
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
die("Invalid email format");
}
Example 5: Separating PHP and HTML
// In a separate file, e.g., welcome.php
<h1>Welcome, <?php echo $username; ?>!</h1>
Common Mistakes to Avoid in PHP
PHP is a widely used server-side scripting language for web development. However, developers often overlook best practices, leading to vulnerabilities and inefficiencies. This article delves into common PHP mistakes and offers comprehensive solutions.
Table of Content
- Not Using Prepared Statements
- Ignoring Error Handling
- Poor Password Security
- Lack of Input Validation
- Mixing PHP and HTML
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