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     * @throws restore_ui_exception for an invalid stage
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     * @throws restore_ui_exception for an invalid stage
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     * @param int|null $stage The desired stage to intialise or null for the default
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     * @param int|null $stage The desired stage to intialise or null for the default
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     * @param array $params
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     * @param array $params
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     * @return restore_ui_stage_initial|restore_ui_stage_schema|restore_ui_stage_confirmation|restore_ui_stage_final
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     * @return restore_ui_stage_initial|restore_ui_stage_schema|restore_ui_stage_confirmation|restore_ui_stage_final
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     */
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     */
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    protected function initialise_stage($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_CONFIRM, PARAM_INT);
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            $stage = optional_param('stage', self::STAGE_CONFIRM, PARAM_INT);
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        }
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        }
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        $class = 'restore_ui_stage_'.self::$stages[$stage];
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        $class = 'restore_ui_stage_'.self::$stages[$stage];
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        if (!class_exists($class)) {
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        if (!class_exists($class)) {