Large Array Problem

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  • Mark
    #1

    Large Array Problem

    I am using PHP 4.3.5. I am having a problem in which my script is
    crashing when it is using a large array. I have simplified the
    problem down to the following example:

    <?
    set_time_limit( 0);
    echo("<html><bo dy>test<br>");
    $array1 = array();
    $value1 = 1;
    for ($index = 0; $index < 160000; $index++)
    {
    $array1[] = $value1;
    }
    for($index = 0; $index < 100; $index++)
    {
    echo("index = $index, value = $array1[$index]<br>");
    }
    echo("done<br>" );
    echo("</body></html>");
    exit(0);
    ?>

    If I run the above code it crashes with nothing displayed to the
    screen. If I change the loop to go to 80000 instead of 160000 then it
    works fine.

    Also, I can keep the loop setting at 160000 but change the line:
    $array1[] = $value1;
    to instead read
    $array1[] = 1;
    and then it also works fine.

    Why does it fail when there are 160000 elements in the array that are
    set with a variable?

    Thanks,
    Mark
    Tags: None
    • michel
      #2
      Re: Large Array Problem

      Try:
      print("index = $index, value = $array1[$index]<br>");flush( );

      and see where it goes wrong exactly. it will give you the output directly.

      Mich

      "Mark" <marktmp87342@y ahoo.com> wrote in message
      news:5f18923b.0 406092155.5efa5 61f@posting.goo gle.com...[color=blue]
      > I am using PHP 4.3.5. I am having a problem in which my script is
      > crashing when it is using a large array. I have simplified the
      > problem down to the following example:
      >
      > <?
      > set_time_limit( 0);
      > echo("<html><bo dy>test<br>");
      > $array1 = array();
      > $value1 = 1;
      > for ($index = 0; $index < 160000; $index++)
      > {
      > $array1[] = $value1;
      > }
      > for($index = 0; $index < 100; $index++)
      > {
      > echo("index = $index, value = $array1[$index]<br>");
      > }
      > echo("done<br>" );
      > echo("</body></html>");
      > exit(0);
      > ?>
      >
      > If I run the above code it crashes with nothing displayed to the
      > screen. If I change the loop to go to 80000 instead of 160000 then it
      > works fine.
      >
      > Also, I can keep the loop setting at 160000 but change the line:
      > $array1[] = $value1;
      > to instead read
      > $array1[] = 1;
      > and then it also works fine.
      >
      > Why does it fail when there are 160000 elements in the array that are
      > set with a variable?
      >
      > Thanks,
      > Mark[/color]


        Comment

        • Chung Leong
          #3
          Re: Large Array Problem

          "Mark" <marktmp87342@y ahoo.com> wrote in message
          news:5f18923b.0 406092155.5efa5 61f@posting.goo gle.com...[color=blue]
          > I am using PHP 4.3.5. I am having a problem in which my script is
          > crashing when it is using a large array. I have simplified the
          > problem down to the following example:
          >
          > <?
          > set_time_limit( 0);
          > echo("<html><bo dy>test<br>");
          > $array1 = array();
          > $value1 = 1;
          > for ($index = 0; $index < 160000; $index++)
          > {
          > $array1[] = $value1;
          > }
          > for($index = 0; $index < 100; $index++)
          > {
          > echo("index = $index, value = $array1[$index]<br>");
          > }
          > echo("done<br>" );
          > echo("</body></html>");
          > exit(0);
          > ?>
          >
          > If I run the above code it crashes with nothing displayed to the
          > screen. If I change the loop to go to 80000 instead of 160000 then it
          > works fine.
          >
          > Also, I can keep the loop setting at 160000 but change the line:
          > $array1[] = $value1;
          > to instead read
          > $array1[] = 1;
          > and then it also works fine.
          >
          > Why does it fail when there are 160000 elements in the array that are
          > set with a variable?[/color]

          What do you mean by "crashing?" Did Apache (or whatever) blow up or did you
          just get a blank page? On computers with small amount of memory, PHP can
          indeed crash the server.


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