What common mistakes or pitfalls can occur when using PHP to output HTML code within a script?

One common mistake when outputting HTML code within a PHP script is forgetting to properly escape special characters, which can lead to syntax errors or security vulnerabilities. To solve this, you can use the htmlspecialchars() function to encode special characters before outputting the HTML code. 

<?php
$html_code = "<h1>Welcome to my website</h1>";
echo htmlspecialchars($html_code);
?>

Keywords

echo htmlspecialchars XSS escaping concatenation

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