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     *
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     *
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     * @param int $stage The desired stage to intialise or null for the default
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     * @param int $stage The desired stage to intialise or null for the default
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     * @param array $params
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     * @param array $params
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     * @return backup_ui_stage_initial|backup_ui_stage_schema|backup_ui_stage_confirmation|backup_ui_stage_final
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     * @return backup_ui_stage_initial|backup_ui_stage_schema|backup_ui_stage_confirmation|backup_ui_stage_final
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     */
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     */
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    protected function initialise_stage($stage = null, array $params = null) {
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    protected function initialise_stage($stage = null, ?array $params = null) {
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        if ($stage == null) {
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        if ($stage == null) {
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            $stage = optional_param('stage', self::STAGE_INITIAL, PARAM_INT);
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            $stage = optional_param('stage', self::STAGE_INITIAL, PARAM_INT);
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        }
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        }
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        if (self::$skipcurrentstage) {
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        if (self::$skipcurrentstage) {
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            $stage *= 2;
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            $stage *= 2;