我怎么能修复php var_dump错误

I am trying to use php to verify my html form a file.txt in witch i have a login , password. the problem in my php code that even when the variables are equal i get false when i compare them.The only exception is when i compare the first login and pasword i get true for both.

Here is my code to clarify my problem. so my html form calls this php page code.

<?php
echo " begin <br/>";
    $name=$_GET['username'];
    $password=$_GET['password'];
        echo "$name <br/>";
        echo "$password <br/>";
         $f = fopen("file.txt", "r");
         $res="0";  
            while(!feof($f))
           { echo "begin while <br/> ";
                $p3=fgetc($f );
                 while($p3!="|" && !feof($f) )
                 {
                  $user1=$user1.$p3;    
                  $p3=fgetc($f); 

                 } 
                  $p1=fgetc($f);
                    while($p1!="|" && !feof($f))
                     { $pass=$pass.$p1; 
                       $p1=fgetc($f); 
                     }
                     $p2=fgetc($f);
                    while($p2!="|" && !feof($f))
                      {
                        $q=$q.$p2;  
                        $p2=fgetc($f);  
                      }
                      var_dump($user1 == $name);
                    var_dump($password == $pass);
                    echo "<br/> $user1 <br/>";
                    echo "$pass <br/>";
                    echo "compare <br/>";
                    echo "$name <br/>";
                    echo "$password <br/>";
                 if( $name == $user1 && $password == $pass )
                   {  echo "succeeded <br/>";
                      echo "droit: $q <br/>";
                      echo "$res <br/>";
                        $res="1";
                        echo "$res <br/>";
                        break 2;
                    }

                    unset($p3);
                    unset($p1);
                    unset($p2);
                    unset($user1);
                    unset($pass);
                    unset($q);
             }
    fclose($f);
    if($res == "1")
        { echo "ok <br/>";}
    else 
        { echo " error <br/>";}

  echo " fin <br/>"
    ?>

my file.txt

abc|abc|87|
aaa|ccc|45|
ghi|ghi|67

now if i enter login abc password abc , iget this result in my page

 begin
abc
abc
begin while
bool(true) bool(true)
abc
abc
compare
abc
abc
succeeded
droit: 87
0
1 

now if i enter login aaa and password ccc , i get

begin
aaa
ccc
begin while
bool(false) bool(false)
abc
abc
compare
aaa
ccc
begin while
bool(false) bool(true)
aaa
ccc
compare
aaa
ccc
begin while
bool(false) bool(false)
ghi
ghi
compare
aaa
ccc
error
fin 

and even for the third user line i get an error even though the variable are equal.

I appreciate it, if any one could help me . and thanks in advance