php - wordpress - custom default Gravatar + localhost support hack

add_custom_gravatar.php

/* AVATAR */
// Add a default avatar to Settings > Discussion
add_filter( 'avatar_defaults', 'add_custom_gravatar' );
if ( !function_exists('add_custom_gravatar') ) {
	function add_custom_gravatar( $avatar_defaults ) {
		$myavatar = get_stylesheet_directory_uri() . '/_inc/img/avatar.png';
		$avatar_defaults[$myavatar] = 'Avatar Santé Ensemble';

		return $avatar_defaults;
	}
}

//Hack the default beahvior of gravatar to enable custom avatars on localhost
add_filter( 'get_avatar', 'so_14088040_localhost_avatar', 10, 5 );
function so_14088040_localhost_avatar( $avatar, $id_or_email, $size, $default, $alt )
{
    $whitelist = array( 'localhost', '127.0.0.1' );

    if( !in_array( $_SERVER['SERVER_ADDR'] , $whitelist ) )
        return $avatar;

    $doc = new DOMDocument;
    $doc->loadHTML( $avatar );
    $imgs = $doc->getElementsByTagName('img');
    if ( $imgs->length > 0 ) 
    {
        $url = urldecode( $imgs->item(0)->getAttribute('src') );
        $url2 = explode( 'd=', $url );
        $url3 = explode( '&', $url2[1] );
        $avatar= "<img src='{$url3[0]}' alt='' class='avatar avatar-64 photo' height='42' width='42' />";
    }
    return $avatar;
}

/* AVATAR */