SOLVED: PHP Warning: htmlspecialchars(): charset `ANSI_X3.4-1968'... messages in ssl_error_log

[B F]

Operating System: CentOS Linux release 7.7.1908 (Core)

/var/log/httpd/ssl_error_log reports the messages:

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PHP Warning:  htmlspecialchars(): charset `ANSI_X3.4-1968' not supported, assuming utf-8 in /usr/share/zoneminder/www/includes/functions.php

Solution:

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# yum install php-mbstring

# httpd -k restart