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function array_udiff_assoc () {
    // Returns the entries of arr1 that have values which are not present in any of the others arguments but do additional checks whether the keys are equal. Entries are compared by user supplied function.  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/array_udiff_assoc    // +   original by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: array_udiff_assoc({0: 'kevin', 1: 'van', 2: 'Zonneveld'}, {0: 'Kevin', 4: 'van', 5: 'Zonneveld'}, function (f_string1, f_string2){var string1 = (f_string1+'').toLowerCase(); var string2 = (f_string2+'').toLowerCase(); if (string1 > string2) return 1; if (string1 == string2) return 0; return -1;});
    // *     returns 1: {1: 'van', 2: 'Zonneveld'}
    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(arr[k], arr1[k1]) === 0 && k === k1) {
                    // 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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array_udiff_assoc({0: 'kevin', 1: 'van', 2: 'Zonneveld'}, {0: 'Kevin', 4: 'van', 5: 'Zonneveld'}, function (f_string1, f_string2){var string1 = (f_string1+'').toLowerCase(); var string2 = (f_string2+'').toLowerCase(); if (string1 > string2) return 1; if (string1 == string2) return 0; return -1;});

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{1: 'van', 2: 'Zonneveld'}