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Description

The "get_avatar" filter can be used to alter the avatar image returned by the get_avatar() function.

The Filter is used at the very end of the get_avatar() function, like this:

    return apply_filters( 'get_avatar', $avatar, $id_or_email, $size, $default, $alt, $args );

• $avatar Image tag for the user's avatar.
• $id_or_email A user ID, email address, or comment object.
• $size Square avatar width and height in pixels to retrieve.
• $default (Optional) URL for the default image or a default type.
• $alt Alternative text to use in the avatar image tag.
• $args @since 4.2.0 (Optional) Extra arguments to retrieve the avatar.

There are two tricky parts to using this filter:

1. get_avatar() can be passed a user ID, user object or email address. So we will not know what we are looking at and will need to check for them all.
2. It returns the entire image html string with classes, alt, and src. So you need to recreate the entire thing, not just send back the image url.

Example

In this example, I am looking for user with an id of 1 and sending back a custom image.

// Apply filter
add_filter( 'get_avatar' , 'my_custom_avatar' , 1 , 5 );

function my_custom_avatar( $avatar, $id_or_email, $size, $default, $alt ) {
    $user = false;

    if ( is_numeric( $id_or_email ) ) {

        $id = (int) $id_or_email;
        $user = get_user_by( 'id' , $id );

    } elseif ( is_object( $id_or_email ) ) {

        if ( ! empty( $id_or_email->user_id ) ) {
            $id = (int) $id_or_email->user_id;
            $user = get_user_by( 'id' , $id );
        }

    } else {
        $user = get_user_by( 'email', $id_or_email );	
    }

    if ( $user && is_object( $user ) ) {

        if ( $user->data->ID == '1' ) {
            $avatar = 'YOUR_NEW_IMAGE_URL';
            $avatar = "<img alt='{$alt}' src='{$avatar}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
        }

    }

    return $avatar;
}