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function array_diff_ukey () {
    // Returns the entries of arr1 that have keys which are not present in any of the others arguments. User supplied function is used for comparing the keys. This function is like array_udiff() but works on the keys instead of the values. The associativity is preserved.  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/array_diff_ukey    // +   original by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: $array1 = {blue: 1, red: 2, green: 3, purple: 4}
    // *     example 1: $array2 = {green: 5, blue: 6, yellow: 7, cyan: 8}
    // *     example 1: array_diff_ukey($array1, $array2, function (key1, key2){ return (key1 == key2 ? 0 : (key1 > key2 ? 1 : -1)); });
    // *     returns 1: {red: 2, purple: 4}    var arr1 = arguments[0], retArr = {}, cb = arguments[arguments.length-1];
    var arr = {}, i = 1, k1 = '', k = '';
 
    cb = (typeof cb === 'string') ? this.window[cb] : (cb instanceof Array) ? this.window[cb[0]][cb[1]] : cb;
     arr1keys:
    for (k1 in arr1) {
        for (i=1; i < arguments.length-1; i++) {
            arr = arguments[i];
            for (k in arr) {                if (cb(k, k1) === 0) {
                    // If it reaches here, it was found in at least one array, so try next value
                    continue arr1keys;
                }
            }            retArr[k1] = arr1[k1];
        }
    }
 
    return retArr;}

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$array1 = {blue: 1, red: 2, green: 3, purple: 4}
$array2 = {green: 5, blue: 6, yellow: 7, cyan: 8}
array_diff_ukey($array1, $array2, function (key1, key2){ return (key1 == key2 ? 0 : (key1 > key2 ? 1 : -1)); });

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{red: 2, purple: 4}