How can one troubleshoot PHP scripts that are not successfully loading livestreams?

To troubleshoot PHP scripts that are not successfully loading livestreams, first check the URL of the livestream to ensure it is correct and accessible. Next, verify that the PHP script is properly handling the livestream URL and displaying it correctly on the webpage. Finally, check for any errors in the PHP code that may be causing the livestream not to load. 

<?php
$livestream_url = "https://example.com/livestream";

// Check if livestream URL is accessible
if (filter_var($livestream_url, FILTER_VALIDATE_URL)) {
    echo "<iframe src='$livestream_url'></iframe>";
} else {
    echo "Invalid livestream URL";
}
?>

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