write data to file according to their filename

####config file#####
<?php
$File1 = USA_TEXT;
$File2 = AUSTRALIA_TEXT;
$File3 = BRAZIL_TEXT;
 
$nation1=USA;
$nation2=AUSTRALIA;
$nation3=BRAZIL;
 
$Nationality = "$nation1:$File1,$nation2:$File2,$nation3:$File3";
 
?>
 
 
####Student.php#####
<?php
//why all data print to all file?
//how to put USA to USA_TEXT file,AUSTRALIA to AUSTRALIA_TEXT and BRAZIL to BRAZIL_TEXT
 
class student
{
 
 
//get studentid from config file
function GetNationalityFromConfigFile()
 {
  require("config.php");
  $this->GetNationality = $Nationality;
 
  $this->GetNationality_array = split(",",$this->GetNationality);
  foreach($this->GetNationality_array as $GetNationality_value)
	{
	  list($GetStudentNationality, $GetStudentFilename) = split(":", $GetNationality_value);
      $this->StudentNationalityReturn[] = $GetStudentNationality;
     
	  $this->StudentFileReturn[] = $GetStudentFilename.".txt";
	 
	}
 }
 
 
 function GetStudentID()
 {
  // Connect to database
 
  $dbLink = mysql_connect("localhost","root" ,"");
  $i = 0; 
  $j = 0; 
  
  foreach ($this->StudentNationalityReturn as $StudentNationalityReturn_value)
   {
   	$result =  mysql_query("SELECT STUDENTTYPE.STUDENTID.STUDENTID AS STUDENTID,STUDENTTYPE.STUDENTID.NATIONALITYID AS  NATIONALITYID
	FROM STUDENTTYPE.STUDENTID JOIN  STUDENTTYPE.STUDENTNATION ON   STUDENTTYPE.STUDENTID.NATIONALITYID = STUDENTTYPE.STUDENTNATION.NATIONALITYID
	WHERE NATIONALITY =\"$StudentNationalityReturn_value\"");
    
	
	while($row = mysql_fetch_array($result))
    {
	 $this->GetNationalityIDReturn[$i] = $row['NATIONALITYID']; 
     $i++;
	 $this->GetStudentIDReturn[$j] = $row['STUDENTID']; 
     $j++;
    } 
   }
  mysql_close($dbLink);
 }
 
 
function GetStudentInformation()
 {
  // Connect to database
  $dbLink = mysql_connect("localhost","root" ,"");
  if(!$dbLink) die("Could not connect to database. " . mysql_error());
    
  foreach ( $this->GetStudentIDReturn as $StudentIDReturn_value)
   {
   	$result =  mysql_query("SELECT STUDENTINFO.STUDENTADDRESS.STUDENTADDRESS AS STUDENTADDRESS
	FROM STUDENTINFO.STUDENTADDRESS
	WHERE STUDENTID =\"$StudentIDReturn_value\"");
    if(!$result) die("Query didn't work. " . mysql_error());
	
	while($row = mysql_fetch_array($result))
    {
	 $this->GetNationalityIDReturn = $row['STUDENTADDRESS']; 
    } 
   $output = "|{$this->GetNationalityIDReturn}|"; 
   
   foreach($this->StudentFileReturn as $writetofile)
	   {
	    file_put_contents($writetofile,$output, FILE_APPEND); 
	   }
   }
  mysql_close($dbLink);
 }
 
 
}
?>