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function include_once (filename) {
    // !No description available for include_once. @php.js developers: Please update the function summary text file.
    // 
    // version: 911.2217
    // discuss at: http://phpjs.org/functions/include_once    // +   original by: Legaev Andrey
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Michael White (http://getsprink.com)
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    // -    depends on: include
    // %        note 1: Uses global: php_js to keep track of included files (though private static variable in namespaced version)
    // *     example 1: include_once('http://www.phpjs.org/js/phpjs/_supporters/pj_test_supportfile_2.js');
    // *     returns 1: true    var cur_file = {};
    cur_file[this.window.location.href] = 1;
 
    // BEGIN STATIC
    try { // We can't try to access on window, since it might not exist in some environments, and if we use "this.window"            //    we risk adding another copy if different window objects are associated with the namespaced object
        php_js_shared; // Will be private static variable in namespaced version or global in non-namespaced
                                       //   version since we wish to share this across all instances
    }
    catch(e) {        php_js_shared = {};
    }
    // END STATIC
    
    if (!php_js_shared.includes) {        php_js_shared.includes = cur_file;
    }
    if (!php_js_shared.includes[filename]) {
        if (this.include(filename)){
            return true;        }
    } else{
        return true;
    }
    return false;}

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include_once('http://www.phpjs.org/js/phpjs/_supporters/pj_test_supportfile_2.js');

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true