After adding a few Kb of records dbase files get corrupted. Here is the script I used to detect the bug:

<?php
echo "teste";
//dl("dbase.dll");
if(!file_exists("teste.dbf"))
{
    $estrutura2=array(array("NUMERO","c",10,0),array("NUMERO2","N",10,0),array("NUMERO3","N",10,0),
                      array("NUMERO4","c",10,0),array("NUMERO5","N",10,0),array("NUMERO6","N",10,0));
    dbase_create("teste.dbf",$estrutura2);
}
 
 $cli_id=dbase_open("teste.dbf",2);
 for($x=0;$x<1000;$x++)
 {
     $linha=array($x,$x+1,$x,$x,$x,$x);
     dbase_add_record($cli_id,$linha);
  }
  dbase_close($cli_id);
  
?>
      Hope I hear from you soon (excuse my losy english..)

                                      Thanks,

                                 Carlos Sousa From Portugal