Check the latest jQuery library from the server. If fails, load the library from the local directory.

Connection fails fallback with PHP file read

<?php
/**
 * According to the lhrec_106's answer at StackOverflow
 * http://stackoverflow.com/a/17339542/1743124
 */


$jQueryLatestURI = "http://code.jquery.com/jquery-latest.min.js";
@$connection = fopen( $jQueryLatestURI, "r" );

        /**
         * FALLBACK
         * Check whether the jQuery library from server is available or not
         * If available, load from server,
         * If not, load from the local 'js' directory
         */

        if($connection) {

            /* Latest jQuery Library from Server */
            <script type='text/javascript' src='<?php echo $jQueryLatestURI; ?>'></script>
        } else {

            /* In-Package jQuery Library */
            <script type='text/javascript' src='js/jquery.js'></script>

        } //endif($connection)
?>