前端之家收集整理的这篇文章主要介绍了
php使用GD库创建图片缩略图的方法，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
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：
<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a><a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a>@H_<a href="/tag/403/" target="_blank" class="keywords">403</a>_7@
<<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<H1><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a><a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a></H1>
<form enctype="multipart/form-data" action="Upload.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>" method="post">
<input name="upfile" type="file"><BR>
<input type="submit" value="Submit">
</form>
<body>
</body>
</html>
</pre>
</div>
<p>相应的Upload.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a><a href="/tag/daima/" target="_blank" class="keywords">代码</a>：</p>
<div class="jb51code">
<pre class="brush:<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>;">
<?<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>
$uploadfile = "upfiles/".$_FILES['upfile']['name'];
//<a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a>后<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>所在的<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>名和路径
$smallfile = "upfiles/small_".$_FILES['upfile']['name'];
//<a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a>后<a href="/tag/suoluetu/" target="_blank" class="keywords">缩略图</a><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>所在的<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>名和路径
if($_FILES['upfile']['type'] != "image/pjpeg")
{
echo "<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>类型<a href="/tag/cuowu/" target="_blank" class="keywords">错误</a>"; //<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a><a href="/tag/cuowu/" target="_blank" class="keywords">错误</a>信息
}
else
{
move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile);
//<a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>
$dstW = 200; //设定<a href="/tag/suoluetu/" target="_blank" class="keywords">缩略图</a>的宽度
$dstH = 200; //设定<a href="/tag/suoluetu/" target="_blank" class="keywords">缩略图</a>的高度
$src_image = ImageCreateFromJPEG($uploadfile);
//读取JPEG<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>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,$src_image,$dstW,$dstH,$srcW,$srcH);
//将图像重定义大小后写入新的图像对象
ImageJpeg($dst_image,$smallfile); //创建<a href="/tag/suoluetu/" target="_blank" class="keywords">缩略图</a><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>
echo "<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a><a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a>完成<BR>"; //<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a><a href="/tag/shangchuan/" target="_blank" class="keywords">上传</a>成功的信息
echo "<img src="$smallfile" mce_src="$smallfile"></img>";
//在<a href="/tag/yemian/" target="_blank" class="keywords">页面</a>上<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a><a href="/tag/suoluetu/" target="_blank" class="keywords">缩略图</a>
}
?>
</pre>
</div>
<p>希望本文所述对大家的<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>程序设计有所帮助。</p></div>
<div class="topcard-tags"><a href="/tag/GDku/" class="tag_link" target="_blank">GD库</a><a href="/tag/phpp/" class="tag_link" target="_blank">php</a><a href="/tag/tupian/" class="tag_link" target="_blank">图片</a><a href="/tag/tupianp/" class="tag_link" target="_blank">图片</a><a href="/tag/ptupian/" class="tag_link" target="_blank">图片</a><a href="/tag/suoluetu/" class="tag_link" target="_blank">缩略图</a></div>
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