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Warning: A non-numeric value encountered in /usr/share/wordpress/wp-includes/SimplePie/Parse/Date.php on line 694

PHP 7.1から出力されるようになった．

workaround

$ diff -u /usr/share/wordpress/wp-includes/SimplePie/Parse/Date.php.org /usr/share/wordpress/wp-includes/SimplePie/Parse/Date.php
--- /usr/share/wordpress/wp-includes/SimplePie/Parse/Date.php.org       2019-03-24 07:14:11.000000000 +0900
+++ /usr/share/wordpress/wp-includes/SimplePie/Parse/Date.php   2020-05-07 17:38:17.073858005 +0900
@@ -691,7 +691,7 @@
                        }
 
                        // Convert the number of seconds to an integer, taking decimals into account
-                       $second = round($match[6] + $match[7] / pow(10, strlen($match[7])));
+                       $second = round((int)$match[6] + (int)$match[7] / pow(10, strlen((int)$match[7])));
 
                        return gmmktime($match[4], $match[5], $second, $match[2], $match[3], $match[1]) - $timezone;
                }

pkg管理のためupgrade毎に修正が必要