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WordPress学习—get_avatar()详解

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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