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HomeBackend DevelopmentPHP TutorialWordPress中用于获取及自定义头像图片的PHP脚本详解_php技巧

get_avatar()(获取头像)
get_avatar() 函数用来获取置顶邮箱或者用户的头像代码,在评论列表中非常常用。

这个函数提供一个 get_avatar 过滤器,用来过滤头像的 Html 代码(img 标签)。

如果在后台 “设置” 的 “讨论” 里关闭 “显示头像选项” 则返回 False.

用法

get_avatar( $id_or_email, $size, $default, $alt );

参数

$id_or_email

(整数 | 字符串 | 对象)(必须)用户的 ID;邮箱;评论或者用户的对象。如果在循环中可以使用 get_the_author_meta( 'ID' ) 函数调用当前文章的作者。

默认值:None

$size

(整数)(可选)头像的尺寸,最大为 512,单位为像素(px)。

默认值:96
get_avatar()(获取头像)
$default

(字符串)(可选)如果没有头像返回的图片,默认为 “神秘人”,可以是图片 URL.

默认值:空字符串(神秘人)

$alt

(字符串)(可选)头像 img 标签的 alt 属性内容。

默认值:False

返回值

(字符串 | 布尔)返回一个头像的 img 标签,如果在后台 “设置” 的 “讨论” 里关闭 “显示头像选项” 则返回 False.

例子

评论列表:

<&#63;php echo get_avatar( $GLOBALS['comment'] ); &#63;>

循环,获取当前文章作者头像:

<&#63;php echo get_avatar( get_the_author_meta( 'ID' ), 32 ); &#63;>

自定义邮箱:

<&#63;php echo get_avatar( 'email@example.com', 32, '', '自定义邮箱' ); &#63;>


自定义头像图片的 alt 标签
WordPress 默认使用的是 Gravatar 头像,通过 get_avatar() 函数调用,一般用来在调用评论的时候使用。

利用 get_avatar() 函数的第四个属性 $alt 可以设置返回代码的 alt 标签,但是大多数人在使用的时候都不会去设置,也就变成了空白。

搜索引擎的爬虫是无法读取图片上到底是什么内容的,只能靠它的 alt 标签,没有了 alt 标签的图片,对 SEO 是非常不好的。

如果想要给所有的头像都统一加上一个 alt 标签,可以把下边的代码放到主题的 functions.php(了解更多) 文件。

/**
  *WordPress 自定义头像图片的 alt 标签
  *根据不同的人生成不同的 alt 标签
  *http://www.endskin.com/avatar-alt/
*/
function Bing_avatar_alt( $avatar ){
  $alt = 'Gravatar 头像';//alt 标签的内容
  $before = strpos( $avatar, "alt='" );
  $after = strpos( $avatar, "'", $before );
  if( $before === false || $after === false ) return $avatar;
  $alt = esc_attr( $alt );
  return substr( $avatar, 0, $before ) . "alt='$alt" . substr( $avatar, $after + strlen( "'" ) );
}
add_filter( 'get_avatar', 'Bing_avatar_alt' );

这样就行了,注意修改代码里的 $alt 变量为你要修改成的 alt 标签内容。

根据不同的人生成不同的 alt 标签

如果要根据不同的人放置不同的 alt 标签可以用下边的例子代码:

/**
  *WordPress 自定义头像图片的 alt 标签
  *http://www.endskin.com/avatar-alt/
*/
function Bing_avatar_alt( $avatar, $id_or_email ){
  if( $id_or_email == 'bingoblog@163.com' || $id_or_email === 1 ){
    $alt = '博主 Gravatar 头像';//博主的 alt 标签内容
  }else{
    $alt = 'Gravatar 头像';//普通访客的 alt 标签内容
  }
  $before = strpos( $avatar, "alt='" );
  $after = strpos( $avatar, "'", $before );
  if( $before === false || $after === false ) return $avatar;
  $alt = esc_attr( $alt );
  return substr( $avatar, 0, $before ) . "alt='$alt" . substr( $avatar, $after + strlen( "'" ) );
}
add_filter( 'get_avatar', 'Bing_avatar_alt', 10, 2 );

如果已经设置 alt 标签则不替换

如果你需要在已经设置 alt 标签的内容(get_avatar() 函数的 $alt 属性)则不替换的时候可以用下边的代码:

/**
  *WordPress 自定义头像图片的 alt 标签
  *如果已经设置 alt 标签则不替换
  *http://www.endskin.com/avatar-alt/
*/
function Bing_avatar_alt( $avatar, $id_or_email, $size, $default, $alt ){
  if( !empty( $alt ) ) return $avatar;
  $alt = 'Gravatar 头像';//alt 标签的内容
  $before = strpos( $avatar, "alt='" );
  $after = strpos( $avatar, "'", $before );
  if( $before === false || $after === false ) return $avatar;
  $alt = esc_attr( $alt );
  return substr( $avatar, 0, $before ) . "alt='$alt" . substr( $avatar, $after + strlen( "'" ) );
}
add_filter( 'get_avatar', 'Bing_avatar_alt', 10, 5 );


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