JsPHP: a JavaScript library providing the PHP API

function reset (arr) {
    // http://jsphp.co/jsphp/fn/view/reset
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Legaev Andrey
    // +    revised by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: Uses global: php_js to store the array pointer
    // *     example 1: reset({0: 'Kevin', 1: 'van', 2: 'Zonneveld'});
    // *     returns 1: 'Kevin' 
    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};
    this.php_js.pointers = this.php_js.pointers || [];
    var indexOf = function (value) {
        for (var i = 0, length = this.length; i < length; i++) {
            if (this[i] === value) {
                return i;
            }
        }
        return -1;
    };
    // END REDUNDANT
    var pointers = this.php_js.pointers;
    if (!pointers.indexOf) {
        pointers.indexOf = indexOf;
    }
    if (pointers.indexOf(arr) === -1) {
        pointers.push(arr, 0);
    }
    var arrpos = pointers.indexOf(arr);
    if (Object.prototype.toString.call(arr) !== '[object Array]') {
        for (var k in arr) {
            if (pointers.indexOf(arr) === -1) {
                pointers.push(arr, 0);
            } else {
                pointers[arrpos + 1] = 0;
            }
            return arr[k];
        }
        return false; // Empty
    }
    if (arr.length === 0) {
        return false;
    }
    pointers[arrpos + 1] = 0;
    return arr[pointers[arrpos + 1]];
}