What are some common pitfalls when using PHP to process form data and write to a text file?

One common pitfall when using PHP to process form data and write to a text file is not properly sanitizing user input, which can lead to security vulnerabilities like SQL injection or cross-site scripting attacks. To solve this issue, always use functions like `htmlspecialchars()` or `mysqli_real_escape_string()` to sanitize user input before writing it to a file. 

// Sanitize user input before writing to a text file
$data = htmlspecialchars($_POST['data']);

// Write sanitized data to a text file
$file = fopen("data.txt", "a");
fwrite($file, $data . "\n");
fclose($file);

Keywords

PHP form data text file security vulnerabilities error handling

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