I can’t seem to get my post form working correctly in PHP, despite hours of troubleshooting as well as it being a relatively simple program

I’m new to PHP and am having trouble with what seems like a relatively simple program. I can’t get my $_POST['Username'] to equal my $temp and therefore never echo'success!'; even if i echo every check and i can physically see that they equal, success never prints. Any help is greatly appreciated <3.

<?php
    if(isset($_POST['submit']))
    {
        if (file_exists('logins.txt')) 
        {   
            echo 'The file was found' . '<br>';        
            $file = fopen('logins.txt', 'r');
            while (feof($file) == false) 
            {
                $temp = fgets($file, 20);
                if ($temp === $_POST['Username'])
                {
                    echo'success!';
                }else
                {
                    echo 'failed' . '<br>';
                    echo $temp . '<br>';
                    echo $_POST['Username'] . '<br>';
                }
            
            };
            fclose($file);
        }
    }

    ?>
<HTML>
    <body>
    
    <form action="" method="post">
        Username

        <input type="text" name="Username" size="30" value="">  
 
        Password

        <input type="text" name="Password" size="30" value="">
 
        <input type="submit" name="submit"  value="Login"> 
        
    </form>
    
    </body>
</HTML>

JavaScript
​x
 
<?php    if(isset($_POST['submit']))    {        if (file_exists('logins.txt'))         {               echo 'The file was found' . '<br>';                    $file = fopen('logins.txt', 'r');            while (feof($file) == false)             {                $temp = fgets($file, 20);                if ($temp === $_POST['Username'])                {                    echo'success!';                }else                {                    echo 'failed' . '<br>';                    echo $temp . '<br>';                    echo $_POST['Username'] . '<br>';                }                        };            fclose($file);        }    }​    ?><HTML>    <body>        <form action="" method="post">        Username​        <input type="text" name="Username" size="30" value="">           Password​        <input type="text" name="Password" size="30" value="">         <input type="submit" name="submit"  value="Login">             </form>        </body></HTML>​

Picture of the output using a textfile with the letters a – e

Answer

replace

if ($temp === $_POST['Username'])

JavaScript
 
if ($temp === $_POST['Username'])​

with

if (trim($temp) == trim($_POST['Username']))

JavaScript
 
if (trim($temp) == trim($_POST['Username']))​

you probably have some space or something in your file

to better understand what is going on you can try to replace

echo $temp . '<br>';
echo $_POST['Username'] . '<br>';

JavaScript
 
echo $temp . '<br>';echo $_POST['Username'] . '<br>';​

with

var_dump($temp,$_POST['Username'])

JavaScript
 
var_dump($temp,$_POST['Username'])​

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Answer