php上传图片客户端和服务器端代码示范

php上传图片客户端和服务器端代码演示

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);
				?>