Load jQuery fron Google CDN with local fallback - WordPress style

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<?php

/* 
**** Load jQuery from Google CDN if available, local fallback if not ****

** Place in your theme's functions.php or relevant file. Edit local jQuery path if needed.
** Works as-is with WordPress Bones Theme v1.2 https://github.com/eddiemachado/bones (replace wp_enqueue_script( 'jquery' ); on line 142
** reference: http://wp.tutsplus.com/tutorials/load-jquery-from-google-cdn-with-local-fallback-for-wordpress/

*/

$url = 'http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js'; // the URL to check against
$test_url = @fopen($url,'r'); // test parameters
if($test_url !== false) { // test if the URL exists
    function load_external_jQuery() { // load external file
        wp_deregister_script( 'jquery' ); // deregisters the default WordPress jQuery
        wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js'); // register the external file
        wp_enqueue_script('jquery'); // enqueue the external file
    }
	add_action('wp_enqueue_scripts', 'load_external_jQuery'); // initiate the function
} else {
    function load_local_jQuery() {
        wp_enqueue_script('jquery'); // enqueue built in WordPress version
    }
add_action('wp_enqueue_scripts', 'load_local_jQuery'); // initiate the function
}

?>