If remove comment and try to work with both of databases
in same time, this cause segmentation fault with creation 
core dump

In php 3.015 all work good

<?php
  require '$DBZAKAZ$.inc';
//  $DB_ZAKAZ = ibase_connect($DB_ZAKAZ_PATH, $USERNAME, $PASSWORD);
  $DB_MAILBOX = ibase_connect($DB_MAILBOX_PATH, $USERNAME, $PASSWORD);

  $Insert_ML = ibase_prepare($DB_MAILBOX, "insert into MAILS_LIST
    values (?, ?, ?, ?, ?, NULL, NULL, 0, ?)");
  $Insert_MB = ibase_prepare($DB_MAILBOX, "insert into MAILS_BODY
    values (?, ?)");
//  $Update_ZS = ibase_prepare($DB_ZAKAZ, "update ZAKAZ_FOR_NEW
//    set SENDET=\"T\" where ID=?");
  $SQL_MB_NEW_NO = ibase_prepare($DB_MAILBOX,
    "select * from GET_NO_NEW_MAILS_BODY");
  $SQL_ML_NEW_NO = ibase_prepare($DB_MAILBOX,
    "select * from GET_NO_NEW_MAILS_LIST");
//  $SQL_Phone = ibase_prepare($DB_ZAKAZ,
//      "select * from PHONE_FOR_NEW_ZAKAZ where ZAKAZ_ID=?");
//  $SQL_PhoneRecordCount = ibase_prepare($DB_ZAKAZ,
//    "select count(*) from PHONE_FOR_NEW_ZAKAZ where ZAKAZ_ID=?");
//  $SQL_Option = ibase_prepare($DB_ZAKAZ,
//    "select * from OPTIONS_FOR_ZAKAZ_NEW_VIEW where ZAKAZ_ID=?");
//  $SQL_OptionRecordCount = ibase_prepare($DB_ZAKAZ,
//    "select count(*) from OPTIONS_FOR_ZAKAZ_NEW_VIEW where ZAKAZ_ID=?");
//  $SQL_Fillial = ibase_prepare($DB_ZAKAZ,
//    "select * from fillials_list where (ZAKAZ='t' or ZAKAZ='T')
//    and E_MAIL is not null and id in (select parrent_fillial
//    from marki_for_zakaz where marka=?)");
//  $SQL_FillialRecordCount = ibase_prepare($DB_ZAKAZ,
//    "select count(*) from fillials_list where (ZAKAZ='t' or ZAKAZ='T')
//     and E_MAIL is not null and id in (select parrent_fillial
//     from marki_for_zakaz where marka=?)");

// Work with Data
// Free Queries
  ibase_free_query($Insert_ML);
  ibase_free_query($Insert_MB);
//  ibase_free_query($Update_ZS);
  ibase_free_query($SQL_MB_NEW_NO);
  ibase_free_query($SQL_ML_NEW_NO);
//  ibase_free_query($SQL_Phone);
//  ibase_free_query($SQL_PhoneRecordCount);
//  ibase_free_query($SQL_Option);
//  ibase_free_query($SQL_OptionRecordCount);
//  ibase_free_query($SQL_Fillial);
//  ibase_free_query($SQL_FillialRecordCount);

//  ibase_close($DB_ZAKAZ);
  ibase_close($DB_MAILBOX);
  echo "<B>Ok!!!</B>";
?>