wordpress博客Gravatars头像缓存(插件及非插件)

   1:  function get_avatar( $id_or_email, $size = '96', $default = '', $alt = false ) { 

   2:  $default = get_bloginfo('url').'/avatar/default.jpg'; 

   3:    

   4:  if ( ! get_option('show_avatars') ) 

   5:  return false; 

   6:    

   7:  if ( false === $alt) 

   8:  $safe_alt = ''; 

   9:  else

  10:  $safe_alt = esc_attr( $alt ); 

  11:    

  12:  if ( !is_numeric($size) ) 

  13:  $size = '96'; 

  14:    

  15:  $email = ''; 

  16:  if ( is_numeric($id_or_email) ) { 

  17:  $id = (int) $id_or_email; 

  18:  $user = get_userdata($id); 

  19:  if ( $user ) 

  20:  $email = $user->user_email; 

  21:  } elseif ( is_object($id_or_email) ) { 

  22:  // No avatar for pingbacks or trackbacks 

  23:  $allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) ); 

  24:  if ( ! empty( $id_or_email->comment_type ) && ! in_array( $id_or_email->comment_type, (array) $allowed_comment_types ) ) 

  25:  return false; 

  26:    

  27:  if ( !empty($id_or_email->user_id) ) { 

  28:  $id = (int) $id_or_email->user_id; 

  29:  $user = get_userdata($id); 

  30:  if ( $user) 

  31:  $email = $user->user_email; 

  32:  } elseif ( !empty($id_or_email->comment_author_email) ) { 

  33:  $email = $id_or_email->comment_author_email; 

  34:  } 

  35:  } else { 

  36:  $email = $id_or_email; 

  37:  } 

  38:    

  39:  if ( empty($default) ) { 

  40:  $avatar_default = get_option('avatar_default'); 

  41:  if ( empty($avatar_default) ) 

  42:  $default = 'mystery'; 

  43:  else

  44:  $default = $avatar_default; 

  45:  } 

  46:    

  47:  if ( !empty($email) ) 

  48:  $email_hash = md5( strtolower( $email ) ); 

  49:    

  50:  if ( is_ssl() ) { 

  51:  $host = 'https://secure.gravatar.com'; 

  52:  } else { 

  53:  if ( !empty($email) ) 

  54:  $host = sprintf( "http://%d.gravatar.com", ( hexdec( $email_hash[0] ) % 2 ) ); 

  55:  else

  56:  $host = 'https://0.gravatar.com'; 

  57:  } 

  58:    

  59:  if ( 'mystery' == $default ) 

  60:  $default = "$host/avatar/ad516503a11cd5ca435acc9bb6523536?s={$size}"; // ad516503a11cd5ca435acc9bb6523536 == md5('unknown@gravatar.com') 

  61:  elseif ( 'blank' == $default ) 

  62:  $default = includes_url('images/blank.gif'); 

  63:  elseif ( !empty($email) && 'gravatar_default' == $default ) 

  64:  $default = ''; 

  65:  elseif ( 'gravatar_default' == $default ) 

  66:  $default = "$host/avatar/s={$size}"; 

  67:  elseif ( empty($email) ) 

  68:  $default = "$host/avatar/?d=$default&s={$size}"; 

  69:  elseif ( strpos($default, 'http://') === 0 ) 

  70:  $default = add_query_arg( 's', $size, $default ); 

  71:    

  72:  if ( !empty($email) ) { 

  73:  $p = '/avatar/'; 

  74:  $f = md5(strtolower($email_hash)); 

  75:  $a = $p . $f . '.jpg'; 

  76:  $e = ABSPATH . $a; 

  77:  $t = 14*24*60*60; //14天 

  78:  if (!is_file($e) || ((is_file($e) && (time()-filemtime($e)) > $t))){ 

  79:  $out = "$host/avatar/"; 

  80:  $out .= $email_hash; 

  81:  $out .= '?s='.$size; 

  82:    

  83:  $rating = get_option('avatar_rating'); 

  84:  if ( !empty( $rating ) ) 

  85:  $out .= "&r={$rating}"; 

  86:    

  87:  @copy($out, $e); 

  88:  } 

  89:  $out = get_bloginfo('url').$a; 

  90:    

  91:  /*$out = "$host/avatar/"; 

  92:  $out .= $email_hash; 

  93:  $out .= '?s='.$size; 

  94:  $out .= '&d=' . urlencode( $default );*/

  95:    

  96:  $avatar = "<img class="avatar avatar-{$size} photo" src="{$out}" alt="{$safe_alt}" width="{$size}" height="{$size}" />"; 

  97:  } else { 

  98:  $avatar = "<img class="avatar avatar-{$size} photo avatar-default" src="{$default}" alt="{$safe_alt}" width="{$size}" height="{$size}" />"; 

  99:  } 

 100:    

 101:  return apply_filters('get_avatar', $avatar, $id_or_email, $size, $default, $alt); 

 102:  }