Problemi con il tema tanzaku

May 01 20:00:57 assenza apache[1278589]: [Sun May 01 20:00:57.664209 2022] [proxy_fcgi:error] [pid 203:tid 140186381969152] [client 127.0.0.1:34664] AH01071: Got error 'PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function split() in /opt/noblogs/www/wp-content/themes/tanzaku/functions.php:69\nStack trace:\n#0 /opt/noblogs/www/wp-content/themes/tanzaku/index.php(96): adjust_grid_image()\n#1 /opt/noblogs/www/wp-includes/template-loader.php(106): include('/opt/noblogs/ww...')\n#2 /opt/noblogs/www/wp-blog-header.php(19): require_once('/opt/noblogs/ww...')\n#3 /opt/noblogs/www/index.php(17): require('/opt/noblogs/ww...')\n#4 {main}\n  thrown in /opt/noblogs/www/wp-content/themes/tanzaku/functions.php on line 69', referer: https://le1101.noblogs.org/?s&paged=16