What are the best practices for outputting PHP variables within HTML to avoid syntax errors?

When outputting PHP variables within HTML, it is important to properly escape the variables to avoid syntax errors or security vulnerabilities. One common method is to use the `echo` or `print` functions to output the variables within the HTML code. Another approach is to enclose the PHP variable within curly braces `${}` when using double quotes in HTML strings. Additionally, using the `htmlspecialchars` function can help prevent cross-site scripting attacks by converting special characters to HTML entities. 

<?php
// Example of outputting PHP variable within HTML using echo function
$name = "John Doe";
echo "<p>Hello, $name!</p>";

// Example of outputting PHP variable within HTML using htmlspecialchars function
$username = "<script>alert('XSS attack');</script>";
echo "<p>Welcome, " . htmlspecialchars($username) . "!</p>";
?>

Keywords

PHP variables outputting HTML syntax errors

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