php用流方式制作缩略图

  •   2009-07-31/22:48
  • 其中db_mysql.inc.php,config.php,function.php不是真正使用到的,关键是$filename 文件名,我是通过读取数据库中的图片名称

    <?php
    include_once ('inc/db_mysql.inc.php');
    include_once ('inc/config.php');
    include_once ('class/function.php');

    global $picPath;

    if (strstr($_SERVER[HTTP_USER_AGENT],"MSIE")) {
      $attachment = '';
    } else {
      $attachment = ' atachment;';
    }

    $image = getInfo('newssp_gallery','id',$_GET['id']);

    $filename = $picPath.$image['filename'];

    if (!file_exists($filename)) {
      $filename = $picPath."notexist.gif";
    }

    header("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP/1.1
    header("Cache-Control: post-check=0, pre-check=0", false);
    header("Pragma: no-cache");                 // HTTP/1.0

    header("Content-disposition:".$attachment." filename=".$image['original']);

    $size = @filesize($filename);

    header("Content-Length: $size");

    $fd = @fopen($filename,rb);
    $contents = @fread($fd,$size);
    @fclose ($fd);

    echo $contents;
    ?>

    使用的时候可以把在html文件里加上

    <img src='showpic.php?id=xxx' width='50' height='50'>

    showpic.php及上面的那个php文件,id=xxx是数据库里的记录ID,width是缩略图的宽,height是缩略图的高,请不要同时宽高都上,例如,你要实现宽为50的缩略图,只要<img src='showpic.php?id=xxx' width='50'>这样就可以了


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