php上传图片客户端和服务器端实现方法

本文实例讲述了php上传图片客户端和服务器端实现方法。分享给大家供大家参考。具体如下：

前台表单代码

    <form name="form1" method="post" action="admin_upfile.php" enctype="multipart/form-data">
      <input type="file" name="pic">
      <input type="submit" name="Submit" value="开始上传" class="button">
    </form>

后端php代码

    <?php
    //这里上传 $upsize判断上传文件的大小
    $uppath = "/attached/"; //文件上传路径
    //转换根目录的路径
    if (strpos($uppath, "/") == 0)
    {
      $i = 0;
      $thpath = $_SERVER["SCRIPT_NAME"];
      $thpath = substr($thpath, 1, strlen($thpath));
      while (strripos($thpath, "/") !== false)
      {
     $thpath = substr($thpath, strpos($thpath, "/") + 1, strlen($thpath));
     $i = ++$i;
      }
      $pp = "";
      for ($j = 0; $j < $i; ++$j)
      {
     $pp .= "../";
      }
      $uppaths = $pp . substr($uppath, 1, strlen($thpath));
    }
    $filename = date("y-m-d");
    if (is_dir($uppaths . $filename) != TRUE)
      mkdir($uppaths . $filename, 0777);
    $f = $_FILES['pic'];
    if ($f["type"] != "image/gif" && $f["type"] != "image/pjpeg" && $f["type"] != "image/jpeg" && $f["type"] != "image/x-png")
    {
      echo "<script>alert('只能上传图片格式的文件');window.close()</script>";
      return false;
    }
    //获得文件扩展名
    $temp_arr = explode(".", $f["name"]);
    $file_ext = array_pop($temp_arr);
    $file_ext = trim($file_ext);
    $file_ext = strtolower($file_ext);
    //新文件名
    $new_file_name = md5(date("YmdHis")) . '.' . $file_ext;
    echo $dest = $uppaths . $filename . "/" . date("ymdhis") . "_" . 
    $new_file_name; //设置文件名为日期加上文件名避免重复 上传目录
    echo $dest1 = $uppath . $filename . "/" . date("ymdhis") . "_" . 
    $new_file_name; //设置文件名为日期加上文件名避免重复
    $r = move_uploaded_file($f['tmp_name'], $dest);
    ?>

希望本文所述对大家的php程序设计有所帮助。