dongsui0929
dongsui0929
2015-04-21 12:22

我怎么能修复php var_dump错误

已采纳

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

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2条回答

  • douli4337 douli4337 6年前

    Looks like your $user1 is corrupted... are you sure there are no char after 'aaa' ? like 'aaa ' ? try to trim it : trim($name) == trim($user1)... otherwise, try to compare "$name" == "$user1" ?

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  • douhan8009 douhan8009 6年前

    You get this result because you have newlines on your text file.

    As the second user is parsed the first character after the pipe | is a newline and becomes the first character of $user1

    You don't see that on your output because you're looking at it in your browser.

    You can quick fix that by trimming $user1 as "Random" suggested.

    Or instruct your code to skip newlines in the first block.

    while(!feof($f))
    {
        echo "begin while <br/> ";
    
        $p3=fgetc($f );
        while( $p3 == "
    " || $p3 == "" )
        {
            $p3=fgetc( $f );
        }
        // ....
    
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