How can PHP developers ensure valid XHTML when including variables in URLs?

To ensure valid XHTML when including variables in URLs, PHP developers can use the `urlencode()` function to properly encode the variables before appending them to the URL. This function will ensure that special characters are encoded correctly, preventing any potential validation errors. 

$variable = "example value";
$encoded_variable = urlencode($variable);
$url = "https://www.example.com/page.php?var=" . $encoded_variable;
echo $url;

Keywords

XHTML PHP URL encoding htmlspecialchars validation

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