php - sql query was working and now not? insert user ip address into table? -

my sql query working fine 5 hours ago , it's not? have not touched thing.

can please me bottom of this, should users ip address , store in table along current time , date, not inserting anything, appreciate help.

here table:

+-------------------------------------------------------------+ |session_id |    user_ip     |    session_start  | session_end| |===========|================|===================|============| |          1|  192.135.123.13|   23:02:20 10:23  | null       | +-------------------------------------------------------------+ 

here sql:

// ip address  $sql = "insert ptb_sessions (session_id, user_ip, session_start, session_end) values (null, '" . $_server['remote_addr'] . "', now(), null);";   mysql_query($sql, $connection); ?>   

go step step.

1. try inserting simplest data values sets (1, '127.0.0.1', now(), now())
2. if ok, try adding $_server['remote_addr'] instead of 127.0.0.1

be careful case in tables , columns names.

if 1 not work in php code, try execute sql insert directly mysql gui (mysql workbench example), error should raised.

if insertion works fine mysql gui, check connection parameters in php.