JsPHP: a JavaScript library providing the PHP API

function array_map (callback) {
    // http://jsphp.co/jsphp/fn/view/array_map
    // +   original by: Andrea Giammarchi (http://webreflection.blogspot.com)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: Takes a function as an argument, not a function's name
    // %        note 2: If the callback is a string, it can only work if the function name is in the global context
    // *     example 1: array_map( function (a){return (a * a * a)}, [1, 2, 3, 4, 5] );
    // *     returns 1: [ 1, 8, 27, 64, 125 ]
    var argc = arguments.length,
        argv = arguments;
    var j = argv[1].length,
        i = 0,
        k = 1,
        m = 0;
    var tmp = [],
        tmp_ar = [];

    while (i < j) {
        while (k < argc) {
            tmp[m++] = argv[k++][i];
        }

        m = 0;
        k = 1;

        if (callback) {
            if (typeof callback === 'string') {
                callback = this.window[callback];
            }
            tmp_ar[i++] = callback.apply(null, tmp);
        } else {
            tmp_ar[i++] = tmp;
        }

        tmp = [];
    }

    return tmp_ar;
}