What are the common challenges faced when using PHP for template variable replacement?

One common challenge when using PHP for template variable replacement is ensuring proper escaping to prevent security vulnerabilities such as cross-site scripting (XSS) attacks. To solve this issue, you can use the htmlentities function to escape the variable values before outputting them in the template. 

// Example of properly escaping variable for template output
$name = "<script>alert('XSS attack!');</script>";
$escaped_name = htmlentities($name);
echo "Hello, $escaped_name!";

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PHP template variable replacement challenges escaping security

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