How can the use of htmlspecialchars() in PHP help prevent security vulnerabilities when outputting data in HTML?

When outputting data in HTML, it's important to properly escape special characters to prevent XSS (Cross-Site Scripting) attacks. Using the htmlspecialchars() function in PHP helps to convert potentially harmful characters like <, >, ", ', and & into their HTML entity equivalents, rendering them harmless when displayed in the browser. 

// Example PHP code snippet using htmlspecialchars() to prevent XSS vulnerabilities
$data = &quot;&lt;script&gt;alert(&#039;XSS attack!&#039;);&lt;/script&gt;&quot;;
echo htmlspecialchars($data, ENT_QUOTES, &#039;UTF-8&#039;);

Keywords

htmlspecialchars security vulnerabilities PHP outputting data HTML

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