Use mb_* string methods to extract first character for generated avatars
This fixes #8451 where the first character is a non-ASCII character. The `$string[0]` notation only extracted one byte and thus resulting in an invalid code. The `mb_strtoupper` method also allows to convert characters independently from the current locale on the server. See also http://php.net/manual/en/function.mb-strtoupper.php Signed-off-by: Morris Jobke <hey@morrisjobke.de>
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@ -246,7 +246,7 @@ class Avatar implements IAvatar {
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* @return string
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*/
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private function generateAvatar($userDisplayName, $size) {
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$text = strtoupper(substr($userDisplayName, 0, 1));
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$text = mb_strtoupper(mb_substr($userDisplayName, 0, 1), 'UTF-8');
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$backgroundColor = $this->avatarBackgroundColor($userDisplayName);
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$im = imagecreatetruecolor($size, $size);
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