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function require_once (filename) {
    // !No description available for require_once. @php.js developers: Please update the function summary text file.
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/require_once    // +   original 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)
    // %        note 1: Uses global: php_js to keep track of included files (though private static variable in namespaced version)    // -    depends on: require
    // *     example 1: require_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; 
    // save include state for reference by include_once and require_once()
    // 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.require(filename)) {
            return true;
        }    } else {
        return true;
    }
    return false;
}

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

1

true