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Use mb_* string methods to extract first character for generated avatars 

This fixes #8451 where the first character is a non-ASCII character. The `$string[0]` notation only extracted one byte and thus resulting in an invalid code. The `mb_strtoupper` method also allows to convert characters independently from the current locale on the server.

See also http://php.net/manual/en/function.mb-strtoupper.php

Signed-off-by: Morris Jobke <hey@morrisjobke.de>
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Morris Jobke 2018-02-21 10:32:46 +01:00
parent a3de507b76
commit f1568b96ce
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lib/private/Avatar.php
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@ -246,7 +246,7 @@ class Avatar implements IAvatar {
* @return string
*/
private function generateAvatar($userDisplayName, $size) {
$text = strtoupper(substr($userDisplayName, 0, 1));
$text = mb_strtoupper(mb_substr($userDisplayName, 0, 1), 'UTF-8');
$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
$im = imagecreatetruecolor($size, $size);