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function runkit_function_add (funcname, arglist, code) {
    // !No description available for runkit_function_add. @php.js developers: Please update the function summary text file.
    // 
    // version: 911.815
    // discuss at: http://phpjs.org/functions/runkit_function_add    // +   original by: Brett Zamir (http://brett-zamir.me)
    // %          note 1: Function can only be added to the global context; use create_function() for an anonymous function
    // *     example 1: runkit_function_add('add', 'a, b', "return (a + b);");
    // *     returns 1: true
    if (this.window[funcname] !== undefined) { // Presumably disallows adding where exists, since there is also redefine function        return false;
    }
    
    try {
        this.window[funcname] = Function.apply(null, arglist.split(',').concat(code));    }
    catch (e) {
        return false;
    }
    return true;}

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runkit_function_add('add', 'a, b', "return (a + b);");

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true