uploadimage.php

电子商务---产品发布系统 采用PHP+MYSQL+APACHE的环境,非常方便的一个小系统,可以嵌入其他系统内使用

<?php
	include('..\dbconnect.php');
	
	$id=$_GET['id'];
		
	$filename=$id."photo";
	// 生成图片的宽度和高度 
	$resizewidth=400; 
	$resizeheight=400; 

function ResizeImage($im,$maxwidth,$maxheight,$name){ 
	$width = imagesx($im); 
	$height = imagesy($im); 
		if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){ 
			if($maxwidth && $width > $maxwidth){ 
				$widthratio = $maxwidth/$width; 
				$resizewidth=true; 
				} 
		if($maxheight && $height > $maxheight){ 
				$heightratio = $maxheight/$height; 
				$resizeheight=true; 
				} 
		if($resizewidth && $resizeheight){ 
				if($widthratio < $heightratio){ 
					$ratio = $widthratio; 
					}else{ 
						$ratio = $heightratio; 
							} 
			}elseif($resizewidth){ 
				$ratio = $widthratio; 
		}elseif($resizeheight){ 
			$ratio = $heightratio; 
			} 
	$newwidth = $width * $ratio; 
	$newheight = $height * $ratio; 
	if(function_exists("imagecopyresampled")){ 
		$newim = imagecreatetruecolor($newwidth, $newheight); 
		imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); 
		}else{ 
			$newim = imagecreate($newwidth, $newheight); 
			imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); 
			} 
		ImageJpeg ($newim,$name . ".jpg"); 
		ImageDestroy ($newim); 
		}else{ 
			ImageJpeg ($im,$name . ".jpg"); 
			} 
		} 
		
		
	if($_FILES['image']['size']){ 
		if($_FILES['image']['type'] == "image/pjpeg"){ 
			$im = imagecreatefromjpeg($_FILES['image']['tmp_name']); 
			}
			elseif($_FILES['image']['type'] == "image/x-png"){ 
					$im = imagecreatefrompng($_FILES['image']['tmp_name']); 
			}
			elseif($_FILES['image']['type'] == "image/gif"){ 
				$im = imagecreatefromgif($_FILES['image']['tmp_name']); 
			} 
		if($im){ 
		
		ResizeImage($im,$resizewidth,$resizeheight,$filename); 
		ImageDestroy ($im); 
		
		}
		if ($submit) {
		$sql_image="update products set photo_filename='".$filename."' where id ='$id'";
		//echo $sql_image;
		mysql_query($sql_image,$conn) or die("出错;".mysql_error());
		
		header("Location:../product_view.php?id=$id");
		} 
	}
	
?> 


<script language="javascript">
	function check() {
	if (form.image.value=="") {
		alert("你没有选择图片!")
		return false
		}
	}
</script>
<form method="post" enctype="multipart/form-data" name="form" id="from"  onSubmit=" return check()"> 
<p> 更新图片</p>
<p>
  <input type="file" name="image" size="50" value="浏览">
</p>
<p>
<input name="submit" type="submit" id="submit" value="上传图片"> 
</p>
</form>