get_avatar()

get_avatar() 是 WordPress 默认获取的 Gravatar 头像的函数,函数通过用户 ID 或邮件地址获取用户头像,同时如果要正确显示头像需要将设置/讨论面板下的“显示头像”给勾选上。该函数的定义位于 wp-includes 文件夹下的 pluggable.php 中

相关代码如下:

if ( !function_exists( \'get_avatar\' ) ) :
/**
 * Retrieve the avatar `<img>` 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 WP_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 \'mysteryman\' (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 &lt;img&gt; 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 &lt;img&gt; 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 `<img>` 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\'];
	}
	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
		$id_or_email = get_comment( $id_or_email );
	}
	/**
	 * Filters whether to retrieve the avatar URL early.
	 *
	 * Passing a non-null value will effectively short-circuit get_avatar(), passing
	 * the value through the {@see \'get_avatar\'} filter and returning early.
	 *
	 * @since 4.2.0
	 *
	 * @param string $avatar      HTML for the user\'s avatar. Default null.
	 * @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 WP_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(
		\"<img alt=\'%s\' src=\'%s\' srcset=\'%s\' class=\'%s\' height=\'%d\' width=\'%d\' %s/>\",
		esc_attr( $args[\'alt\'] ),
		esc_url( $url ),
		esc_url( $url2x ) . \' 2x\',
		esc_attr( join( \' \', $class ) ),
		(int) $args[\'height\'],
		(int) $args[\'width\'],
		$args[\'extra_attr\']
	);
	/**
	 * Filters the avatar to retrieve.
	 *
	 * @since 2.5.0
	 * @since 4.2.0 The `$args` parameter was added.
	 *
	 * @param string $avatar      &lt;img&gt; tag for the user\'s avatar.
	 * @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 WP_Comment object.
	 * @param int    $size        Square avatar width and height in pixels to retrieve.
	 * @param string $default     URL for the default image or a default type. Accepts \'404\', \'retro\', \'monsterid\',
	 *                            \'wavatar\', \'indenticon\',\'mystery\' (or \'mm\', or \'mysteryman\'), \'blank\', or \'gravatar_default\'.
	 *                            Default is the value of the \'avatar_default\' option, with a fallback of \'mystery\'.
	 * @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;

使用 get_avatar() 函数

对于 get_avatar() 函数的使用我们一般可以通过以下方式调用:

<?php echo get_avatar( $id_or_email, $size, $default, $alt, $args ); ?>

$id_or_email:必填(整型/字符串/对象)。用户 ID 、邮件地址或者评论区评论对象。

$size:选填(整型)。要返回的 Gravatar 头像的大小,最大为 512 默认 96 。

$default:选填(字符串)。自定义的默认头像地址,默认“神秘人物”头像。

$alt:选填(字符串)。img 标签的 alt 属性值,图像的替换文本,默认为空。

$args:选填(数组)。设置新的参数以替换 get_avatar中 的默认参数。

$args 可设置的参数

如果要设置新的参数以替换 get_avatar中 的默认参数,必须在调用 get_avatar 之前声明新的参数,否则它们将不会生效。以下参数均为可选参数,由于使用较少,此处仅简单说下,具体内容请参阅文后官方文档!

size(整型、大小)、height(整型、高度)、width(整型、宽度)、default(字符串、默认头像)、force_default(布尔型、强制使用默认头像)、rating(字符串、头像等级 ‘G’, ‘PG’, ‘R’, ‘X’)、scheme(字符串,设置 URL 的 Scheme)、class(数组或字符串,设置 img 标签的 class 属性)、force_display(布尔型、是否强制显示 Gravatar 头像即使未勾选“显示头像”)、extra_attr(字符串,设置头像的 attributes 属性)。

官方文档:https://codex.wordpress.org/Function_Reference/get_avatar

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