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WordPress中Gravatar头像缓存到本地及相关优化的技巧,
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WordPress中Gravatar头像缓存到本地及相关优化的技巧,

Jun 13, 2016 am 08:48 AM
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WordPress中Gravatar头像缓存到本地及相关优化的技巧,

将Gravatar全球通用头像缓存的目的在于加快网站的打开速度,因为Gravatar官网的服务器在国外,加上伟大的GFW,国内打开速度经常很慢。方法来自willin,不过貌似他的网站已经打不开了- -
 
将Gravatar全球通用头像缓存到本地
 
缓存方法如下:

1.建立缓存目录
在WordPress根目录建立一个名为 avatar的文件夹,设置该文件夹的权限为 0755 (如果 0755 不行,就试一下 0777)。

2.设置默认头像
准备一张大小适合(32*32即可)的默认头像,命名为"default.jpg" ,放在 avatar 文件夹里面。

3.添加缓存代码
将下面的代码复制到主题的 functions.php 文件中即可

function my_avatar($avatar) {
$tmp = strpos($avatar, 'http');
$g = substr($avatar, $tmp, strpos($avatar, "'", $tmp) - $tmp);
$tmp = strpos($g, 'avatar/') + 7;
$f = substr($g, $tmp, strpos($g, "?", $tmp) - $tmp);
$w = get_bloginfo('wpurl');
$e = ABSPATH .'avatar/'. $f .'.jpg';
$t = 1209600; //設定14天, 單位:秒
if ( !is_file($e) || (time() - filemtime($e)) > $t ) { //當頭像不存在或文件超過14天才更新
copy(htmlspecialchars_decode($g), $e);
} else $avatar = strtr($avatar, array($g => $w.'/avatar/'.$f.'.jpg'));
if (filesize($e) < 500) copy($w.'/avatar/default.jpg', $e);
return $avatar;
}
add_filter('get_avatar', 'my_avatar');
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通过Email判断用户是否有Gravatar头像
很多时候,我们还需要知道用户有没有设置Gravatar,比如如果用户没有设置Gravatar头像则直接显示本地的默认头像,或者提醒没有设置Gravatar的用户设置Gravatar头像,而不打扰已经设置过头像的用户。今天分享的代码可以通过Email地址来验证用户是否有Gravatar头像:

function validate_gravatar($email) {
 $hash = md5(strtolower(trim($email)));
 $uri = 'http://www.gravatar.com/avatar/' . $hash . '&#63;d=404';
 $headers = @get_headers($uri);
 if (!preg_match("|200|", $headers[0])) {
 $has_valid_avatar = FALSE;
 } else {
 $has_valid_avatar = TRUE;
 }
 return $has_valid_avatar;
}
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Gravatar全球通用头像缓存优化

优化后的代码可以避免用户没有设置Gravatar头像时,默认头像重复缓存成多个文件造成资源浪费和重复连接的问题。优化后的代码如下

function my_avatar( $email, $size = '32', $default = '', $alt = '') {
 $f = md5( strtolower( $email ) );
 // 以下代码将头像缓存到wp-content目录下
 $a = get_bloginfo('template_url') . '/avatar/'. $f . $size . '.png';
 $e = get_template_directory() . '/avatar/' . $f . $size . '.png';
 $d = get_template_directory() . '/avatar/' . $f . '-d.png';
 // 如果要将头像缓存到当前主题目录下,请将3-5行代码改成:
 // $a = get_bloginfo('template_url') . '/avatar/'. $f . $size . '.png';
 // $e = get_template_directory() . '/avatar/' . $f . $size . '.png';
 // $d = get_template_directory() . '/avatar/' . $f . '-d.png';

if($default=='')
  $default = get_bloginfo('wpurl').'avatar/default.jpg';
 
 $t = 2592000; // 缓存有效期30天, 这里单位:秒
 if ( !is_file($e) || (time() - filemtime($e)) > $t ) {
  if ( !is_file($d) || (time() - filemtime($d)) > $t ) {
   // 验证是否有头像
   $uri = 'http://www.gravatar.com/avatar/' . $f . '&#63;d=404';
   $headers = @get_headers($uri);
   if (!preg_match("|200|", $headers[0])) {
    // 没有头像,则新建一个空白文件作为标记
    $handle = fopen($d, 'w');
    fclose($handle);
    $a = $default;
   }
   else {
    // 有头像且不存在则更新
    $r = get_option('avatar_rating');
    $g = 'http://www.gravatar.com/avatar/'. $f. '&#63;s='. $size. '&r=' . $r;
    copy($g, $e);
   }
  }
  else {
   $a = $default;
  }
 }
 
 $avatar = "<img alt='{$alt}' src='{$a}' class='avatar avatar-{$size} photo' height='{$size}'    style="max-width:90%" />";
 return apply_filters('my_avatar', $avatar, $email, $size, $default, $alt);
}

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使用这个方法需要在主题所有文件中,将 get_avatar 函数替换为 my_avatar 。
而且如果是

get_avatar( $comment,
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格式的话,还需要改成

my_avatar( $comment->comment_author_email
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因为my_avatar函数只能通过Email来调取用户头像,所以以上情况,需要将第一个参数改成email地址。

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