Sample code
<?
  print "Oracle_Home: " . getenv("ORACLE_HOME") . "<BR>";
  /* If you change the OCILogon to OCIPLogon, no memory           leak! */
  if($conn = OCILogon("<user>","<pwd>","<TNS>"))
  {
    print("Connection succeeded!<BR>");
    $stmt = OCIParse($conn,"select * from all_tables");
    OCIExecute($stmt);
    /* Notice I'm not getting any row or column information
       back... */
    OCIFreeStatement($stmt);
    OCILogoff($conn);
  } else {
    print("Connection failed!<BR>");
  }
?>

Note: I am running a smp kernel (two 550 PIIIs)

php was compiled with:
--with-mysql --with-oci8 --enable-track-vars

I tracked it as far as the OCIServerDetach call in oci8.c...the memory is not released after this call is made, and there is no error...