ZP-682 Compare the configured LOGBACKEND lowercase.

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/core/zpush.php

@@ -224,7 +224,7 @@ class ZPush {
             define('LOGBACKEND', 'filelog');
         }
 
-        if (LOGBACKEND == 'syslog') {
+        if (strtolower(LOGBACKEND) == 'syslog') {
             define('LOGBACKEND_CLASS', 'Syslog');
             if (!defined('LOG_SYSLOG_FACILITY')) {
                 define('LOG_SYSLOG_FACILITY', LOG_LOCAL0);
@@ -250,7 +250,7 @@ class ZPush {
                 throw new FatalMisconfigurationException("LOG_SYSLOG_HOST is defined but the LOG_SYSLOG_PORT does not seem to be valid.");
             }
         }
-        elseif (LOGBACKEND == 'filelog') {
+        elseif (strtolower(LOGBACKEND) == 'filelog') {
             define('LOGBACKEND_CLASS', 'FileLog');
             if (!defined('LOGFILEDIR'))
                 throw new FatalMisconfigurationException("The LOGFILEDIR is not configured. Check if the config.php file is in place.");