What are some common issues that arise when users copy and paste HTML code into a text field in PHP applications?

One common issue that arises when users copy and paste HTML code into a text field in PHP applications is that it can lead to potential security vulnerabilities such as Cross-Site Scripting (XSS) attacks. To prevent this, you can use the `htmlspecialchars()` function in PHP to escape special characters in the HTML code before displaying it on the webpage. 

// Escape HTML characters before displaying user input
$userInput = $_POST['user_input'];
$escapedInput = htmlspecialchars($userInput);

echo $escapedInput;

Keywords

HTML code text field PHP applications XSS attacks validation

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