Generating GUID tags with php

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  • Gary Hasler
    #1

    Generating GUID tags with php

    Does anyone have any suggestions on generating GUID (Globally Unique
    Identifier) tags with php?
    They would need to be in the format
    4402bd8a-cd51-40ea-99d7-b510e89e344b

    Specifically this is for adding accessibility for the PicLens browser
    add-on (which uses an .rss file) to some of our photo gallery pages. It
    seems to require each thumbnail have an identical GUID tag in both the
    html and the rss file.
    Tags: None
    • Jeremy
      #2
      Re: Generating GUID tags with php

      Gary Hasler wrote:
      Does anyone have any suggestions on generating GUID (Globally Unique
      Identifier) tags with php?
      They would need to be in the format
      4402bd8a-cd51-40ea-99d7-b510e89e344b
      >
      Specifically this is for adding accessibility for the PicLens browser
      add-on (which uses an .rss file) to some of our photo gallery pages. It
      seems to require each thumbnail have an identical GUID tag in both the
      html and the rss file.
      If a UUID is acceptable for you (GUID usually means Microsoft's
      implementation of UUID; pretty much the same thing, just a 128-bit
      unique identifier) then check out this PECL module:

      http://pecl.php.net/package/uuid


      Jeremy

        Comment

        • Gary Hasler
          #3
          Re: Generating GUID tags with php

          Jeremy wrote:
          >
          Gary Hasler wrote:
          Does anyone have any suggestions on generating GUID (Globally Unique
          Identifier) tags with php?
          They would need to be in the format
          4402bd8a-cd51-40ea-99d7-b510e89e344b

          Specifically this is for adding accessibility for the PicLens browser
          add-on (which uses an .rss file) to some of our photo gallery pages. It
          seems to require each thumbnail have an identical GUID tag in both the
          html and the rss file.
          >
          If a UUID is acceptable for you (GUID usually means Microsoft's
          implementation of UUID; pretty much the same thing, just a 128-bit
          unique identifier) then check out this PECL module:
          >
          http://pecl.php.net/package/uuid

          >
          Jeremy
          Thanks jeremy;
          of course as always happens, shortly after posting I stumbled upon the
          'perfect' solution: md5().
          I can simply use the URL of each picture as string input to the md5
          function, which produces a md5 hash (32 character hex). So it is
          completely predictable, which I want; yet will NEVER be the same unless
          the path to the picture is identical--in which case it will be the same
          file!

          So I made this function (there may be a more elegant way to do it):
          function MakeGUID ($str) {
          $h = "-"; //-- HYPHEN
          $gMd5 = md5($str);
          $guidTag = substr($gMd5,0, 8) . $h . substr($gMd5,7, 4) . $h .
          substr($gMd5,11 ,4) . $h . substr($gMd5,15 ,4) . $h . substr($gMd5,19 ,12);
          return $guidTag;
          }

          ....and use it in both the PHP file for the gallery page and the RSS
          file, giving it the path to each image.
          (Jeez PHP is brilliant...the only hard part is getting the right term to
          search for. I've never heard of md5!)

            Comment

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