WordPress 默认调用头像的函数是 get_avatar(),在开发中可以使用这个函数完成自定义头像。
add_filter( 'get_avatar' , 'my_custom_avatar' , 1 , 5 );
function my_custom_avatar( $avatar, $id_or_email, $size, $default, $alt) {
    if ( ! empty( $id_or_email->user_id ) ) {
        $avatar = get_bloginfo('template_directory') . '/assets/images/avatar.jpg';;
    }else{
        $avatar = get_bloginfo('template_directory') . '/assets/images/avatar.jpg';;
    }
    $avatar = "<img alt='{$alt}' src='{$avatar}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
    return $avatar;
} 
             
                     
    
             
        
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