wordpress custom theme register logo

all_document.php

<?php
//start function.php code

function m1_customize_register( $wp_customize ) {
    $wp_customize->add_setting( 'm1_logo' ); // Add setting for logo uploader
         
    // Add control for logo uploader (actual uploader)
    $wp_customize->add_control( new WP_Customize_Image_Control( $wp_customize, 'm1_logo', array(
        'label'    => __( 'Upload Logo (replaces text)', 'm1' ),
        'section'  => 'title_tagline',
        'settings' => 'm1_logo',
    ) ) );
}
add_action( 'customize_register', 'm1_customize_register' );

//end function.php
?>

<?php
//start header.php where create dynamic logo
?>
 <?php if ( get_theme_mod( 'm1_logo' ) ) : ?>
    <a href="<?php echo esc_url( home_url( '/' ) ); ?>" class="navbar-brand" id="site-logo" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home">
 
        <img src="<?php echo get_theme_mod( 'm1_logo' ); ?>" alt="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>">
 
    </a>
 
    <?php else : ?>
               
    <hgroup>
        <h1 class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>
        <p class="site-description"><?php bloginfo( 'description' ); ?></p>
    </hgroup>
               
<?php endif; ?>
//end header.php