Warning: Undefined array key "tid" in /home/s717/WWW/Special_topic/group/try/a4.php on line 4

Warning: pg_query(): Query failed: ERROR: invalid input syntax for type integer: "" LINE 1: SELECT count(*) from art where tid=''; ^ in /home/s717/WWW/Special_topic/group/try/a4.php on line 5

Fatal error: Uncaught TypeError: pg_fetch_row(): Argument #1 ($result) must be of type resource, bool given in /home/s717/WWW/Special_topic/group/try/a4.php:6 Stack trace: #0 /home/s717/WWW/Special_topic/group/try/a4.php(6): pg_fetch_row(false) #1 {main} thrown in /home/s717/WWW/Special_topic/group/try/a4.php on line 6