wp_customize don't show section code example

Example: wp_customize don't show section

function panel($wp_customize){

$wp_customize->add_panel('some_panel',array(
    'title'=>'Panel1',
    'description'=> 'This is panel Description',
    'priority'=> 10,
));


$wp_customize->add_section('section',array(
    'title'=>'section',
    'priority'=>10,
    'panel'=>'some_panel',
));


$wp_customize->add_setting('setting_demo',array(
    'defaule'=>'a',
));


$wp_customize->add_control('contrl_demo',array(
    'label'=>'Text',
    'type'=>'text',
    'section'=>'section',
    'settings'=>'setting_demo',
));}   add_action('customize_register','panel');

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Php Example