get_avatar( mixed $id_or_email, int $size = 96, string $default = ”, string $alt = ”, array $args = null )

检索用户、电子邮件地址、MD5哈希、评论或帖子的avatar“标记。
Retrieve the avatar “ tag for a user, email address, MD5 hash, comment, or post.

目录锚点：#参数#返回#源码#笔记

参数（Parameters）

参数	类型	必填	说明
$id_or_email	（mixed）	必需
The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash, user email, WP_User object, WP_Post object, or WP_Comment object.	$size	可选
(Optional)	Height and width of the avatar image file in pixels.	可选
(string)	（Optional）	可选
$alt	（string）	可选
Alternative text to use in tag.	$args	可选
(Optional)	Extra arguments to retrieve the avatar. ‘height’（int） Display height of the avatar in pixels. Defaults to $size.	可选
‘force_default'(bool) Whether to always show the default image, never the Gravatar. Default false.	‘rating’（string） What rating to display avatars up to. Accepts ‘G’, ‘PG’, ‘R’, ‘X’, and are judged in that order. Default is the value of the ‘avatar_rating’ option.	可选
‘class'(array|string) Array or string of additional classes to add to the element.	‘force_display’（bool） Whether to always show the avatar – ignores the show_avatars option. Default false.	可选

返回（Return）

（string|false）用户化身的标记。失败时为False。

源码（Source）

/**
 * Retrieve the avatar `` tag for a user, email address, MD5 hash, comment, or post.
 *
 * @since 2.5.0
 * @since 4.2.0 Optional `$args` parameter added.
 *
 * @param mixed $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
 *                           user email, WP_User object, WP_Post object, or comment object.
 * @param int    $size       Optional. Height and width of the avatar image file in pixels. Default 96.
 * @param string $default    Optional. URL for the default image or a default type. Accepts '404'
 *                           (return a 404 instead of a default image), 'retro' (8bit), 'monsterid'
 *                           (monster), 'wavatar' (cartoon face), 'indenticon' (the "quilt"),
 *                           'mystery', 'mm', or 'mysterman' (The Oyster Man), 'blank' (transparent GIF),
 *                           or 'gravatar_default' (the Gravatar logo). Default is the value of the
 *                           'avatar_default' option, with a fallback of 'mystery'.
 * @param string $alt        Optional. Alternative text to use in <img> tag. Default empty.
 * @param array  $args       {
 *     Optional. Extra arguments to retrieve the avatar.
 *
 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size.
 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size.
 *     @type bool         $force_default Whether to always show the default image, never the Gravatar. Default false.
 *     @type string       $rating        What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
 *                                       judged in that order. Default is the value of the 'avatar_rating' option.
 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values.
 *                                       Default null.
 *     @type array|string $class         Array or string of additional classes to add to the <img> element.
 *                                       Default null.
 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option.
 *                                       Default false.
 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized. Default empty.
 * }
 * @return false|string `` tag for the user's avatar. False on failure.
 */
function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args = null ) {
	$defaults = array(
		// get_avatar_data() args.
		'size'          => 96,
		'height'        => null,
		'width'         => null,
		'default'       => get_option( 'avatar_default', 'mystery' ),
		'force_default' => false,
		'rating'        => get_option( 'avatar_rating' ),
		'scheme'        => null,
		'alt'           => '',
		'class'         => null,
		'force_display' => false,
		'extra_attr'    => '',
	);

	if ( empty( $args ) ) {
		$args = array();
	}

	$args['size']    = (int) $size;
	$args['default'] = $default;
	$args['alt']     = $alt;

	$args = wp_parse_args( $args, $defaults );

	if ( empty( $args['height'] ) ) {
		$args['height'] = $args['size'];
	}
	if ( empty( $args['width'] ) ) {
		$args['width'] = $args['size'];
	}

	/**
	 * Filter whether to retrieve the avatar URL early.
	 *
	 * Passing a non-null value will effectively short-circuit get_avatar(), passing
	 * the value through the {@see 'pre_get_avatar'} filter and returning early.
	 *
	 * @since 4.2.0
	 *
	 * @param string            $avatar      HTML for the user's avatar. Default null.
	 * @param int|object|string $id_or_email A user ID, email address, or comment object.
	 * @param array             $args        Arguments passed to get_avatar_url(), after processing.
	 */
	$avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args );

	if ( ! is_null( $avatar ) ) {
		/** This filter is documented in wp-includes/pluggable.php */
		return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
	}

	if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) {
		return false;
	}

	$url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) );

	$args = get_avatar_data( $id_or_email, $args );

	$url = $args['url'];

	if ( ! $url || is_wp_error( $url ) ) {
		return false;
	}

	$class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' );

	if ( ! $args['found_avatar'] || $args['force_default'] ) {
		$class[] = 'avatar-default';
	}

	if ( $args['class'] ) {
		if ( is_array( $args['class'] ) ) {
			$class = array_merge( $class, $args['class'] );
		} else {
			$class[] = $args['class'];
		}
	}

	$avatar = sprintf(
		"",
		esc_attr( $args['alt'] ),
		esc_url( $url ),
		esc_attr( "$url2x 2x" ),
		esc_attr( join( ' ', $class ) ),
		(int) $args['height'],
		(int) $args['width'],
		$args['extra_attr']
	);

	/**
	 * Filter the avatar to retrieve.
	 *
	 * @since 2.5.0
	 * @since 4.2.0 The `$args` parameter was added.
	 *
	 * @param string            $avatar      <img> tag for the user's avatar.
	 * @param int|object|string $id_or_email A user ID, email address, or comment object.
	 * @param int               $size        Square avatar width and height in pixels to retrieve.
	 * @param string            $alt         Alternative text to use in the avatar image tag.
	 *                                       Default empty.
	 * @param array             $args        Arguments passed to get_avatar_data(), after processing.
	 */
	return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
}
endif;

if ( !function_exists( 'wp_text_diff' ) ) :

笔记（Notes）

文章作者的例子，在循环中。
注释示例。
随机电子邮件地址的示例。