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function array_splice (arr, offst, lgth, replacement) {
    // Removes the elements designated by offset and length and replace them with supplied array  
    // 
    // version: 912.2221
    // discuss at: http://phpjs.org/functions/array_splice    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   input by: Theriault
    // %        note 1: Order does get shifted in associative array input with numeric indices,
    // %        note 1: since PHP behavior doesn't preserve keys, but I understand order is
    // %        note 1: not reliable anyways    // %        note 2: Note also that IE retains information about property position even
    // %        note 2: after being supposedly deleted, so use of this function may produce
    // %        note 2: unexpected results in IE if you later attempt to add back properties
    // %        note 2: with the same keys that had been deleted
    // -    depends on: is_int    // *     example 1: input = {4: "red", 'abc': "green", 2: "blue", 'dud': "yellow"};
    // *     example 1: array_splice(input, 2);
    // *     returns 1: {0: "blue", 'dud': "yellow"}
    // *     results 1: input == {'abc':"green", 0:"red"}
    // *     example 2: input = ["red", "green", "blue", "yellow"];    // *     example 2: array_splice(input, 3, 0, "purple");
    // *     returns 2: []
    // *     results 2: input == ["red", "green", "blue", "purple", "yellow"]
    // *     example 3: input = ["red", "green", "blue", "yellow"]
    // *     example 3: array_splice(input, -1, 1, ["black", "maroon"]);    // *     returns 3: ["yellow"]
    // *     results 3: input == ["red", "green", "blue", "black", "maroon"]
    
    var _checkToUpIndices = function (arr, ct, key) {
        // Deal with situation, e.g., if encounter index 4 and try to set it to 0, but 0 exists later in loop (need to        // increment all subsequent (skipping current key, since we need its value below) until find unused)
        if (arr[ct] !== undefined) {
            var tmp = ct;
            ct += 1;
            if (ct === key) {                ct += 1;
            }
            ct = _checkToUpIndices(arr, ct, key);
            arr[ct] = arr[tmp];
            delete arr[tmp];        }
        return ct;
    };
 
    if (replacement && typeof replacement !== 'object') {        replacement = [replacement];
    }
    if (lgth === undefined) {
        lgth = offst >= 0 ? arr.length - offst : -offst;
    } else if (lgth < 0) {        lgth = (offst >= 0 ? arr.length - offst : -offst)  + lgth;
    }
 
    if (!(arr instanceof Array)) {
        /*if (arr.length !== undefined) { // Deal with array-like objects as input        delete arr.length;
        }*/
        var lgt = 0, ct = -1, rmvd = [], rmvdObj = {}, repl_ct=-1, int_ct=-1;
        var returnArr = true, rmvd_ct = 0, rmvd_lgth = 0, key = '';
        // rmvdObj.length = 0;        for (key in arr) { // Can do arr.__count__ in some browsers
            lgt += 1;
        }
        offst = (offst >= 0) ? offst : lgt + offst;
        for (key in arr) {            ct += 1;
            if (ct < offst) {
                if (this.is_int(key)) {
                    int_ct += 1;
                    if (parseInt(key, 10) === int_ct) { // Key is already numbered ok, so don't need to change key for value                        continue;
                    }
                    _checkToUpIndices(arr, int_ct, key); // Deal with situation, e.g.,
                    // if encounter index 4 and try to set it to 0, but 0 exists later in loop
                    arr[int_ct] = arr[key];                    delete arr[key];
                }
                continue;
            }
            if (returnArr && this.is_int(key)) {                rmvd.push(arr[key]);
                rmvdObj[rmvd_ct++] = arr[key]; // PHP starts over here too
            } else {
                rmvdObj[key] = arr[key];
                returnArr    = false;            }
            rmvd_lgth += 1;
            // rmvdObj.length += 1;
 
            if (replacement && replacement[++repl_ct]) {                arr[key] = replacement[repl_ct];
            } else {
                delete arr[key];
            }
        }        // arr.length = lgt - rmvd_lgth + (replacement ? replacement.length : 0); // Make (back) into an array-like object
        return returnArr ? rmvd : rmvdObj;
    }
 
    if (replacement) {        replacement.unshift(offst, lgth);
        return Array.prototype.splice.apply(arr, replacement);
    }
    return arr.splice(offst, lgth);
}

1
2

input = {4: "red", 'abc': "green", 2: "blue", 'dud': "yellow"};
array_splice(input, 2);

1

input == {'abc':"green", 0:"red"}

1
2

input = ["red", "green", "blue", "yellow"];
array_splice(input, 3, 0, "purple");

1

input == ["red", "green", "blue", "purple", "yellow"]