PHP variable is empty in second iteration of loop

Question

Why is the PHP variable defined as $real in the code below empty but still set after one iteration of the while loop yet the $entry variable is both set and contains the correct value on every iteration of the loop. Does the calling of a function '' put the resulting variable outside of the scope and if so how can I fix this?

    <!DOCTYPE html>
 <html>

   <head>
       <meta charset="utf-8">
        <title>Total </title>
          <link type="text/css" rel="stylesheet" href="course.css"> 
           <script src="../jquery.js"></script>
            <script src="../jquery-ui.js"></script>

   </head>
   <body>


  <?php 
      if ($handle = opendir('../uploads')) 
      {
          while (false !== ($entry = readdir($handle))) 
         {

          if ($entry != "." && $entry != "..") 
          {                
            $real= realpath($entry);
              echo  "<button class='files accordian'>$entry $real</button>";
              $real= realpath($entry);

                 if(isset($real))
                    {
                      echo 'the real varibale is set';

                    }
                    else
                    {
                     echo 'the real varibale is not set';
                    }

                 if(empty($real))
                    {
                    echo 'the real varibale is empty';
                    }
                    else
                    {
                    echo 'the real varibale is not empty';
                     echo 'and is '. $real;
                    }

                echo  "<button class='files accordian'>$entry $real</button>
                         <div class='panel'>
                            <p>$real</p>";
          }

        }       
     } 

   ?>  


   </body>
  </html>

Do you have any error checking?Add this to the top of your code add tell the error which is occurring: ini_set('display_errors', 1); ini_set('display_startup_errors', 1); error_reporting(E_ALL); — DaAmidza
– DaAmidza, Commented Jun 6, 2017 at 12:02
Please read minimal reproducible example and edit your question so as we can all understand what is wrong here. — u_mulder
– u_mulder, Commented Jun 6, 2017 at 12:04
from the docs: "Note: The running script must have executable permissions on all directories in the hierarchy, otherwise realpath() will return FALSE." — Jeff
– Jeff, Commented Jun 6, 2017 at 12:04
Are you sure that echo statement is correct? Maybe try something like this: echo "<button....>".$entry." ".$real."</button>"; ? — Shamppi
– Shamppi, Commented Jun 6, 2017 at 12:07

manian · Accepted Answer · 2017-06-06 12:22:34Z

3

Please change your code where you are getting realpath like below,

$real= realpath("../uploads/".$entry);

Issue: you are just trying to get the realpath of a file. So, it is looking the file in your current path where you are executing your file. Hence, you need to append the origin too.

answered Jun 6, 2017 at 12:22

manian

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5 Comments

jon Over a year ago

This is great and works but do you have any idea why it worked on the first iteration of the loop - see photo above ,but not the second. I have amended code and all work now but juts intrigued as to why it is different after the first iteration of the loop? Thanks

manian Over a year ago

Yes, it might work but only for one time. It will work only if you have same file name in both the folders. For your case, it was '.DS_Store'. This file was found in your current folder & in uploads.

manian Over a year ago

@jon, I just tested the code myself. My previous comment was not 100% correct. Actually, it will give you as many realpaths as number of files names match between the 2 folders. if you have 10 files in your current folder matching the files in your uploads directory then it will give you realpaths for all these 10 files.

jon Over a year ago

I am trying to let the user see the file, would this be the path I would need to place in <a href=""> to get the user to see the file if they clicked on this link currently I am getting this result when I do that "The requested URL /Applications/MAMP/htdocs/tutorvid/uploads/Applicatgion Text.pages was not found on this server" please see stackoverflow.com/questions/44400055/get-file-url-schema

manian Over a year ago

@jon, I just posted an answer on the other question

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