Can select, but cannot insert into oracle tables using php.

Question

I am having trouble inserting data into a tables in oracle using PHP. I can insert into the tables using baninst1, but nothing else. I can't even insert using the tables' owner. Every time I try I get the ORA-00492 error of table or view does not exist. However, I can run a select statement just fine. So far, baninst1 is the only user that can actually do inserts. I've triple checked all the table grants and everything is fine. Also, I can copy/paste the exact insert statement into SQL*Plus and it works with the correct user. It doesn't have to be baninst1. I've tried everything I can think of. I've tried putting the table name in quotes, adding the schema name to the table, checking public synonyms, but everything appears to be ok. I would greatly appreciate any suggestions others may have.
I'm using PHP 5.2.3 with an oracle 9i DB.

Answer 1

Here is the code that doesn't work. It works only with baninst1, no other username will work and all I do is change the my_username/my_password to something different. This is one example function where I try to do an insert, but it doesn't work on any of the tables I try.
Thanks for looking.
class Oracle {
     private $oracleUser = "my_username";
     private $oraclePassword = "my_password";
     private $oracleDB = "MY_DB";
     private $c = null;
     function Connect() {
          if ( !($this->c = ocilogon( $this->oracleUser, $this->oraclePassword, $this->oracleDB ) ) )
               return false;
          return true;
     function AddNewTest($testName, $course, $section, $term, $maxAttempts, $length, $startDate, $startTime, $endDate, $endTime)
          $result = "";
          if( $this->c == null )
               $this->Connect();     
          $splitIndex = strpos($course, " ");
          $subjectCode = substr($course, 0, $splitIndex);
          $courseNumber = substr($course, $splitIndex + 1);
          $insertStatment = "insert into szbtestinfo(szbtestinfo_test_name,
                                                            szbtestinfo_course_numb,
                                                       szbtestinfo_section,
                                                            szbtestinfo_max_attempts,
                                                            szbtestinfo_length_minutes,
                                                            szbtestinfo_start,
                                                            szbtestinfo_end,
                                                            szbtestinfo_id,
                                                            szbtestinfo_subj_code,
                                                            szbtestinfo_eff_term)
                                                            values( '" . $testName .
               "', '" . $courseNumber .
               "', '" . $section .
               "', " . $maxAttempts .
               ", " . $length .
               ", to_date('" . $startDate . " " . $startTime . "', 'MM/DD/YYYY HH24:MI')" .
               ", to_date('" . $endDate . " " . $endTime . "', 'MM/DD/YYYY HH24:MI')" .
               ", szsnexttest.nextval" .
               ", '" . $subjectCode .
               "', '" . $term . "')";
          //return $insertStatment;
          $s = OCIParse($this->c, $insertStatment);
          try
               $result = OCIExecute($s);
          catch(exception $e)
          return $result;
     }