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。