How can PHP scripts defend against attacks where malicious code is injected through input fields?

To defend against attacks where malicious code is injected through input fields, PHP scripts can use input validation and sanitization techniques. This involves validating user input to ensure it meets expected criteria and sanitizing input to remove any potentially harmful code. By implementing these measures, PHP scripts can prevent malicious code from being executed and protect against common vulnerabilities like SQL injection and cross-site scripting. 

// Example of input validation and sanitization in PHP

// Validate and sanitize input field
$input = $_POST['input_field'];
$clean_input = filter_var($input, FILTER_SANITIZE_STRING);

// Use the clean input in your script
echo "Clean input: " . $clean_input;

Keywords

SQL injection Cross-site scripting (XSS) htmlspecialchars filter_input prepared statements

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