Add custom mime type for WordPress

wp-add-custom-mime-type.php

<?php
function mihdan_edit_upload_types( $existing_mimes = array() ) {
    // allow .woff
    $existing_mimes['woff'] = 'font/woff';
 
    // disallow .jpg files
    unset( $existing_mimes['jpg'] );
 
    return $existing_mimes;
}
add_filter( 'upload_mimes', 'mihdan_edit_upload_types' );