Change Logo by User Role in Wordpress - php

Question

Hey guys I have been asked to brand the site for my company. We are using Wordpress for it and basically each User Role is a different group that needs to see a different logo on the site.
I am using Eduma by Thimpress as my theme. I feel like it should be as simple as checking what user_role is logged in and changed the logo image, but I don't know where to start to put that condition.
Any help or guidance is much appreciated!
Below is the code I think creates the logo:
<?php
add_action( 'thim_logo', 'thim_logo', 1 );
// logo
if ( !function_exists( 'thim_logo' ) ) :
function thim_logo() {
$thim_logo = get_theme_mod( 'thim_logo', false );
$style = '';
if ( !empty( $thim_logo ) ) {
if ( is_numeric( $thim_logo ) ) {
$logo_attachment = wp_get_attachment_image_src( $thim_logo, 'full' );
if ( $logo_attachment ) {
$src = $logo_attachment[0];
$style = 'width="' . $logo_attachment[1] . '" height="' . $logo_attachment[2] . '"';
} else {
// Default image
// Case: image ID from demo data
$src = get_template_directory_uri() . '/images/logo.png';
$style = 'width="153" height="40"';
}
} else {
$src = $thim_logo;
}
} else {
// Default image
// Case: The first install
$src = get_template_directory_uri() . '/images/logo-sticky.png';
$style = 'width="153" height="40"';
}
$src = thim_ssl_secure_url($src);
echo '<a href="' . esc_url( home_url( '/' ) ) . '" title="' . esc_attr( get_bloginfo( 'name' ) ) . ' - ' . esc_attr( get_bloginfo( 'description' ) ) . '" rel="home" class="no-sticky-logo">';
echo '<img src="' . $src . '" alt="' . esc_attr( get_bloginfo( 'name' ) ) . '" ' . $style . '>';
echo '</a>';
}
endif;
add_action( 'thim_sticky_logo', 'thim_sticky_logo', 1 );
// get sticky logo
if ( !function_exists( 'thim_sticky_logo' ) ) :
function thim_sticky_logo() {
$sticky_logo = get_theme_mod( 'thim_sticky_logo', false );
$style = '';
if ( !empty( $sticky_logo ) ) {
if ( is_numeric( $sticky_logo ) ) {
$logo_attachment = wp_get_attachment_image_src( $sticky_logo, 'full' );
if ( $logo_attachment ) {
$src = $logo_attachment[0];
$style = 'width="' . $logo_attachment[1] . '" height="' . $logo_attachment[2] . '"';
} else {
// Default image
// Case: image ID from demo data
$src = get_template_directory_uri() . '/images/logo-sticky.png';
$style = 'width="153" height="40"';
}
} else {
$src = $sticky_logo;
}
} else {
// Default image
// Case: The first install
$src = get_template_directory_uri() . '/images/logo-sticky.png';
$style = 'width="153" height="40"';
}
$src = thim_ssl_secure_url($src);
echo '<a href="' . esc_url( home_url( '/' ) ) . '" rel="home" class="sticky-logo">';
echo '<img src="' . $src . '" alt="' . esc_attr( get_bloginfo( 'name' ) ) . '" ' . $style . '>';
echo '</a>';
}
endif;

Answer 1

In the file where you set the logo put this code there.
$user = wp_get_current_user();
if ( in_array( 'author', (array) $user->roles ) ) {
//logo for author role
}

Answer 2

That depends on the layout of the theme. Likely, it's in the header.php.
The way to proceed is something like this:
Create a child theme
https://codex.wordpress.org/Child_Themes
Find out what file outputs the link to the logo
Probably header.php but that depends on the theme; ask the theme developer if unsure.
Use for example wp_get_current_user()
https://codex.wordpress.org/Function_Reference/wp_get_current_user
Do a php switch on the outcome of that and output various links
http://php.net/manual/en/control-structures.switch.php