void createCubemapArray(GLuint& cubemap)
{
    //Generate an array texture
    glGenTextures(1, &cubemap);
    glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY, cubemap);

    //Create storage for the texture. (4 layers of 1x1 texels)
    glTexStorage3D(GL_TEXTURE_CUBE_MAP_ARRAY,
        1,                    //No mipmaps as textures are 1x1
        GL_RGB8,              //Internal format
        width, height,                 //width,height
        4                   //Number of layers
    );

    for (unsigned int i(0); i != 4; ++i)
    {
        glTexSubImage3D(GL_TEXTURE_CUBE_MAP_ARRAY,
            0,                     //Mipmap number
            0, 0, i,                 //xoffset, yoffset, zoffset
            1, 1, 1,                 //width, height, depth
            GL_RGB,                //format
            GL_UNSIGNED_BYTE,      //type
            0);                //pointer to data
    }

    glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}

vec3 position = mirrorCam.getPosition();
    view = look_at(position, position + normalise(viewsX[i]), vec3(0.0, -0.5, -0.5));
    drawloop(view, proj, fb[0][i].framebuffer);
    glFramebufferTexture3D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, cubemapArray, 0, 0);

glBindTexture(GL_TEXTURE_2D, cubemapArray);
glUniform1i(glGetUniformLocation(reflectiveShaderID, "cube_array"), 0);

uniform samplerCube cube_texture;
//....
void main()
{
//...
fragment_color = texture(cube_array, vec4(textureCoordinates, 0));
}