php 7.4.* centOS 7 Apache 2

Error;

array_intersect(): Expected parameter 2 to be an array, string given
/plugins/fireunion/blogfront/controllers/Authors.php line 34
TYPE

Undefined

EXCEPTION

ErrorException

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     *
     * @return integer
     */
    public function getCatNames($categories) {
        $this->categoriesOptions = $this->categoriesOptions ?: BlogCategory::orderBy('name')->lists('name', 'id');
        $categoriesNames = array_flip($this->categoriesOptions);
        $cat_names = array_flip(array_intersect($categoriesNames, $categories));
        return implode(', ', $cat_names);
    }
}