How can a default image be displayed instead of [x] for users without avatars in a PHP userlist for phpBB forums?

To display a default image instead of [x] for users without avatars in a PHP userlist for phpBB forums, you can modify the code that generates the avatar display to check if the user has an avatar. If the user does not have an avatar, you can display a default image instead. 

// Check if user has an avatar
if ($user_avatar == 'no_avatar')
{
    $avatar_url = 'path_to_default_image.jpg';
}
else
{
    $avatar_url = $user_avatar;
}

// Display the avatar
echo '<img src="' . $avatar_url . '" alt="User Avatar">';

Keywords

PHP phpBB userlist default image avatar

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