retrieve array subset in random order

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  • kevincw01
    #1

    retrieve array subset in random order

    Anyone have a clever way to retrieve for example, items 0-29 from an
    array of size N>29, in random order? The catch is that I dont want to
    print any items more than once and I dont want to miss any.

    This is for a tag cloud where I have sorted them by popularity but now
    I need to display only the top 30. I do this now but they are in
    order of popularity and its not really a 'cloud'. If I could retrieve
    the top 30 in some random order, it would look better.

    Thanks

    Tags: None
    • Rik
      #2
      Re: retrieve array subset in random order

      kevincw01 <kevin@netkev.c omwrote:
      Anyone have a clever way to retrieve for example, items 0-29 from an
      array of size N>29, in random order? The catch is that I dont want to
      print any items more than once and I dont want to miss any.
      >
      This is for a tag cloud where I have sorted them by popularity but now
      I need to display only the top 30. I do this now but they are in
      order of popularity and its not really a 'cloud'. If I could retrieve
      the top 30 in some random order, it would look better.
      $array = array(....somet hing..);
      $top = array_splice(0, 30,$array);
      shuffle($top);

      Where are you getting your data from? Seems it might be better to not have
      this in the array to begin with.
      --
      Rik Wasmus
      Posted on Usenet, not any forum you might see this in.
      Ask Smart Questions: http://tinyurl.com/anel

        Comment

        • kevincw01
          #3
          Re: retrieve array subset in random order

          On Mar 11, 12:20 am, Rik <luiheidsgoe... @hotmail.comwro te:
          kevincw01 <k...@netkev.co mwrote:
          Anyone have a clever way to retrieve for example, items 0-29 from an
          array of size N>29, in random order? The catch is that I dont want to
          print any items more than once and I dont want to miss any.
          >
          This is for a tag cloud where I have sorted them by popularity but now
          I need to display only the top 30. I do this now but they are in
          order of popularity and its not really a 'cloud'. If I could retrieve
          the top 30 in some random order, it would look better.
          >
          $array = array(....somet hing..);
          $top = array_splice(0, 30,$array);
          shuffle($top);
          >
          Where are you getting your data from? Seems it might be better to not have
          this in the array to begin with.
          --
          Rik Wasmus
          Posted on Usenet, not any forum you might see this in.
          Ask Smart Questions:http://tinyurl.com/anel
          Interesting, I'm getting the famous array reference error with that
          code(first line below):
          <?php $top = array_splice(0, $tags2show,$tag s); ?>
          <?php shuffle($top); ?>

          Fatal Error: Only variables can be passed by reference...

          The fix should be to store function array results in a temp variable
          but I don't see where I'm not doing that?

            Comment

            • kevincw01
              #4
              Re: retrieve array subset in random order

              On Mar 11, 12:38 am, "kevincw01" <k...@netkev.co mwrote:
              On Mar 11, 12:20 am, Rik <luiheidsgoe... @hotmail.comwro te:
              >
              >
              >
              kevincw01 <k...@netkev.co mwrote:
              Anyone have a clever way to retrieve for example, items 0-29 from an
              array of size N>29, in random order? The catch is that I dont want to
              print any items more than once and I dont want to miss any.
              >
              This is for a tag cloud where I have sorted them by popularity but now
              I need to display only the top 30. I do this now but they are in
              order of popularity and its not really a 'cloud'. If I could retrieve
              the top 30 in some random order, it would look better.
              >
              $array = array(....somet hing..);
              $top = array_splice(0, 30,$array);
              shuffle($top);
              >
              Where are you getting your data from? Seems it might be better to not have
              this in the array to begin with.
              --
              Rik Wasmus
              Posted on Usenet, not any forum you might see this in.
              Ask Smart Questions:http://tinyurl.com/anel
              >
              Interesting, I'm getting the famous array reference error with that
              code(first line below):
              <?php $top = array_splice(0, $tags2show,$tag s); ?>
              <?php shuffle($top); ?>
              >
              Fatal Error: Only variables can be passed by reference...
              >
              The fix should be to store function array results in a temp variable
              but I don't see where I'm not doing that?
              Wait I see the problem. That's the incorrect array_splice syntax.
              Correct is array_splice($a rray,first_inde x,last_index). Works well
              now.

                Comment

                • Rik
                  #5
                  Re: retrieve array subset in random order

                  kevincw01 <kevin@netkev.c omwrote:
                  Wait I see the problem. That's the incorrect array_splice syntax.
                  Correct is array_splice($a rray,first_inde x,last_index). Works well
                  now.
                  Oops, still early for a sunday morning :P

                  --
                  Rik Wasmus
                  Posted on Usenet, not any forum you might see this in.
                  Ask Smart Questions: http://tinyurl.com/anel

                    Comment

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