Disable error output on website rendering

semantic-mediawiki is compatible with mediawiki 1.36, but outputs a lot of deprecation
warnings. This was fixed in
https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/4195
but no release has been made as of now. This change will be in release
3.2.4 or 4.0.0, at which point these lines can be removed.

conf/LocalSettings.php

@@ -156,11 +156,15 @@ enableSemantics( getenv("SEMANTIC_URL") );
 # Set Subpages on
 $wgNamespacesWithSubpages[NS_MAIN] = 1;
 
+ini_set('display_errors', '0');
+ini_set('display_startup_errors', '0');
 # Enable long error messages
 if (getenv("DEBUG")) {
     $wgShowExceptionDetails = true;
     $wgShowDBErrorBacktrace = true;
     $wgShowSQLErrors = true;
+    ini_set("display_errors", 1);
+    ini_set('display_startup_errors', '1');
 }
 
 #  Local configuration for MediaWiki