Call to undefined function utf8_decode()

[fbertone]

Hi,
in ubuntu server 16.04 with php7 I get this error while changing the password (the error is in the logs, nothing is shown on the UI):

PHP Fatal error: Uncaught Error: Call to undefined function utf8_decode() in [...]/lib/functions.inc.php:178\nStack trace:\n#0 [...]/pages/change.php(176): check_password_strength('...', '...', Array)\n#1 [...]/index.php(173): include('[...]')\n#2 {main}\n thrown in [...]/lib/functions.inc.php on line 178, referer: [...]/index.php

I solved installing php-xml.
Maybe add a check for function_exists('utf8_decode')?

According to Stack Overflow an alternative should also be using mb_convert_encoding from mbstring, but I haven't tried that.

[coudot]

Yes, we could indeed have a test for utf8_decode like we do for other PHP functions