Created
March 19, 2013 16:49
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In wordpress, a better way to check if an author has a gravatar or not. Sometimes you might want to check to see if a gravatar exists and not display any image if there isn't one. Uses the wordpress HTTP and caching apis. A better version of this: http://codex.wordpress.org/Using_Gravatars#Checking_for_the_Existence_of_a_Gravatar
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| /** | |
| * Utility function to check if a gravatar exists for a given email or id | |
| * @param int|string|object $id_or_email A user ID, email address, or comment object | |
| * @return bool if the gravatar exists or not | |
| */ | |
| function validate_gravatar($id_or_email) { | |
| //id or email code borrowed from wp-includes/pluggable.php | |
| $email = ''; | |
| if ( is_numeric($id_or_email) ) { | |
| $id = (int) $id_or_email; | |
| $user = get_userdata($id); | |
| if ( $user ) | |
| $email = $user->user_email; | |
| } elseif ( is_object($id_or_email) ) { | |
| // No avatar for pingbacks or trackbacks | |
| $allowed_comment_types = apply_filters( 'get_avatar_comment_types', array( 'comment' ) ); | |
| if ( ! empty( $id_or_email->comment_type ) && ! in_array( $id_or_email->comment_type, (array) $allowed_comment_types ) ) | |
| return false; | |
| if ( !empty($id_or_email->user_id) ) { | |
| $id = (int) $id_or_email->user_id; | |
| $user = get_userdata($id); | |
| if ( $user) | |
| $email = $user->user_email; | |
| } elseif ( !empty($id_or_email->comment_author_email) ) { | |
| $email = $id_or_email->comment_author_email; | |
| } | |
| } else { | |
| $email = $id_or_email; | |
| } | |
| $hashkey = md5(strtolower(trim($email))); | |
| $uri = 'http://www.gravatar.com/avatar/' . $hashkey . '?d=404'; | |
| $data = wp_cache_get($hashkey); | |
| if (false === $data) { | |
| $response = wp_remote_head($uri); | |
| if( is_wp_error($response) ) { | |
| $data = 'not200'; | |
| } else { | |
| $data = $response['response']['code']; | |
| } | |
| wp_cache_set($hashkey, $data, $group = '', $expire = 60*5); | |
| } | |
| if ($data == '200'){ | |
| return true; | |
| } else { | |
| return false; | |
| } | |
| } |
If anyone has stumbled across this and has found it isn't working, you'll want to update http:// to https:// for the Gravatar link, as it now only supports SSL.
See here: Automattic/themes#7515
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Well done, BRAVO!