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function runkit_class_adopt (classname, parentname) {
    // !No description available for runkit_class_adopt. @php.js developers: Please update the function summary text file.
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/runkit_class_adopt    // +   original by: Brett Zamir (http://brett-zamir.me)
    // %          note 1: Function can only obtain and set classes from the global context
    // *     example 1: function A () {}
    // *     example 1: A.prototype.methodA = function () {};
    // *     example 1: function B () {}    // *     example 1: runkit_class_adopt('B', 'A');
    // *     returns 1: true
 
    if (typeof this.window[classname] !== 'function' || typeof this.window[parentname] !== 'function') {
        return false;    }
 
    // Classical style of inheritance
    this.window[classname].prototype = new this.window[parentname](); // Has side effects by calling the constructor!
 /*
    // Prototypal completely by reference
    this.window[classname].prototype = parentname.prototype; // By mutual reference!
*/
 /*
    // Mixin (deep copy, not by reference)
    var _copy = function (child, parent) {
        var p = '';
        for (p in parent) {            if (typeof parent[p] === 'object') {
                child[p] = _copy(child[p], parent[p]);
            }
            else {
                child[p] = parent[p];            }
        }
    };
    _copy(this.window[classname].prototype, this.window[parentname].prototype);
*/ 
    // Put original constructor property back
    this.window[classname].constructor = this.window[classname];
    return true;
}

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function A () {}
A.prototype.methodA = function () {};
function B () {}
runkit_class_adopt('B', 'A');

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true