gistfile1.txt

 $customFields = json_decode($value, true);

        if ( ! empty($customFields)) {
            $attributes = [];
            foreach ($customFields as $custom_field) {
                $customFieldData                    = explode('::::', $custom_field);
                $attributes[head($customFieldData)] = end($customFieldData);
            }

            return $this->attributes['custom_fields'] = json_encode($attributes);
        }
        
        
        

if ( ! str_contains($value, '::::')) {
            return $this->attributes['custom_fields'] = $value;
        }

        // Remove required
        $value = explode(',', $value);

        if (is_array($value)) {
            $data  = [];
            $value = array_map(function ($value) {
                return trim(str_replace('::::required', '', preg_replace(['/^\[/', '/\]$/'], '', $value)), '"');
            }, $value);

            foreach ($value as $v) {
                $initData = explode('::::', $v);
                if(count($initData) == 2) {
                    if ($initData[1] != "null") {
                        $data[$initData[0]] = $initData[1];
                    }
                }
            }

            return $this->attributes['custom_fields'] = json_encode($data);
        } else {
            return $this->attributes['custom_fields'] = $value;
        }