Are there any best practices for implementing an online text editor in PHP to prevent users from entering HTML code?

To prevent users from entering HTML code into an online text editor in PHP, you can use the `htmlspecialchars()` function to convert any HTML characters into their respective HTML entities. This will ensure that any HTML code entered by users will be displayed as plain text rather than executed as HTML. 

<?php
// Get the user input from the text editor
$user_input = $_POST['user_input'];

// Sanitize the user input to prevent HTML code execution
$sanitized_input = htmlspecialchars($user_input);

// Display the sanitized input
echo $sanitized_input;
?>

Keywords

XSS prevention HTML purifier htmlspecialchars strip_tags content filtering

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