Adding Custom Logo support to your Theme

function themename_custom_logo_setup() {
    $defaults = array(
        'height'      => 100,
        'width'       => 400,
        'flex-height' => true,
        'flex-width'  => true,
        'header-text' => array( 'site-title', 'site-description' ),
    );
    add_theme_support( 'custom-logo', $defaults );
}
add_action( 'after_setup_theme', 'themename_custom_logo_setup' );


----->


<a href="<?php echo esc_url(home_url('/')); ?>" class="lgx-scroll">
                            <?php

                            $custom_logo_id = get_theme_mod( 'custom_logo' );
                            $logo = wp_get_attachment_image_src( $custom_logo_id , 'small' );
                            if ( has_custom_logo() ) {
                                    echo '<img src="'. esc_url( $logo[0] ) .'">';
                            } else {
                                    echo '<h1>'. get_bloginfo( 'name' ) .'</h1>';
                            }

                            ?>
                         </a>