How can developers detect and remove code injection from their PHP files?

Developers can detect and remove code injection from their PHP files by sanitizing user input, using prepared statements for database queries, and validating all data before processing it. They can also use functions like `htmlspecialchars()` to prevent XSS attacks. 

// Example of sanitizing user input using htmlspecialchars()
$user_input = '<script>alert("Code injection")</script>';
$sanitized_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');
echo $sanitized_input;

Keywords

PHP code injection security filtering validation

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