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Home/ Questions/Q 7410071
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Editorial Team
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Editorial Team
Asked: May 29, 20262026-05-29T06:10:36+00:00 2026-05-29T06:10:36+00:00

How can i check if a file is archived (zip or rar) without knowing

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How can i check if a file is archived (zip or rar) without knowing the extension. I need to find it using php.

I cannot use Fileinfo because its not installed and installation of any other packages on the server its out of the question.

UPDATE:

Zip module its not installed and i cannot install extra packages.
I don’t want to use mime_content_type because its deprecated

Thank you

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  1. Editorial Team
    Editorial Team
    2026-05-29T06:10:37+00:00Added an answer on May 29, 2026 at 6:10 am

    Output from od -c:

      0000000    R   a   r   ! 032  \a  \0 317 220   s  \0  \0  \r  \0  \0  \0
    
      0000000    P   K 003 004  \n  \0  \0  \0  \0  \0  \0  \0   !  \0  \0  \0
    

    You could use something like this:

    <?php
    
    $fh = @fopen($argv[1], "r");
    
    if (!$fh) {
      print "ERROR: couldn't open file.\n";
      exit(126);
    }
    
    $blob = fgets($fh, 5);
    
    fclose($fh);
    
    if (strpos($blob, 'Rar') !== false) {
      print "Looks like a Rar.\n";
    } else
    if (strpos($blob, 'PK') !== false) {
      print "Looks like a ZIP.\n";
    } else {
      print "I dunno.\n";
      exit(1);
    }
    
    ?>
    

    And my output:

    ghoti@baz:~ 423$ ./filephp.php A2.rar
    Looks like a Rar.
    ghoti@baz:~ 424$ ./filephp.php OLDIE.zip 
    Looks like a ZIP.
    ghoti@baz:~ 425$ ./filephp.php 1-11-1.PDF 
    I dunno.
    ghoti@baz:~ 426$ 
    
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