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php使用GD库创建图片缩略图的方法_php技巧

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Release： 2016-05-16 20:14:09
Original
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本文实例讲述了php使用GD库创建图片缩略图的方法。分享给大家供大家参考。具体分析如下：

上传页面的静态html代码：

<html> 
<head> 
<title>文件上传</title> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
</head> 
<H1>文件上传</H1> 
<form enctype="multipart/form-data" action="Upload.php" method="post">  
　　<input name="upfile" type="file"><BR>  
　　<input type="submit" value="Submit">  
</form> 
<body> 
</body> 
</html>
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相应的Upload.php文件代码：

<&#63;php 
$uploadfile = "upfiles/".$_FILES['upfile']['name'];
//上传后文件所在的文件名和路径 
$smallfile = "upfiles/small_".$_FILES['upfile']['name'];
//上传后缩略图文件所在的文件名和路径 
if($_FILES['upfile']['type'] != "image/pjpeg") 
{ 
  echo "文件类型错误"; //输出错误信息 
} 
else 
{ 
  move_uploaded_file($_FILES['upfile']['tmp_name'], $uploadfile);
  //上传文件 
  $dstW = 200; //设定缩略图的宽度 
  $dstH = 200; //设定缩略图的高度 
  $src_image = ImageCreateFromJPEG($uploadfile);
  //读取JPEG文件并创建图像对象 
  $srcW = ImageSX($src_image); //获得图像的宽 
  $srcH = ImageSY($src_image); //获得图像的高 
  $dst_image = ImageCreateTrueColor($dstW,$dstH);
  //创建新的图像对象 
  ImageCopyResized($dst_image,$src_image,0,0,0,0,$dstW,$dstH,$srcW,$srcH);
  //将图像重定义大小后写入新的图像对象 
  ImageJpeg($dst_image,$smallfile); //创建缩略图文件 
  echo "文件上传完成<BR>"; //输出上传成功的信息 
  echo "<img  src="$smallfile" mce_src="$smallfile" alt="php使用GD库创建图片缩略图的方法_php技巧" ></img>";
  //在页面上显示缩略图 
} 
&#63;>
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希望本文所述对大家的php程序设计有所帮助。

Related labels：
gd library php picture thumbnail
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