What is the best practice for creating a text file in PHP based on user input from a form?

When creating a text file in PHP based on user input from a form, it is important to properly sanitize and validate the user input to prevent any security vulnerabilities. Once the input is validated, you can use PHP's file handling functions to create and write to the text file. 

<?php
// Validate and sanitize user input from the form
$user_input = $_POST['user_input']; // Assuming 'user_input' is the name of the form field
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Create a new text file and write the user input to it
$file = fopen('new_file.txt', 'w');
fwrite($file, $sanitized_input);
fclose($file);

echo "Text file created successfully!";
?>

Keywords

file handling fopen fwrite form input file permissions

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