PHP图片上传加水印方法代码
在图片上传过程中，经常要在上传原图的基础上加上图片或者文字水印以给展示自己网站名称及logo的机会。也能在一定程度上降低被别人采集的概率。
下面是用php的方法实现图片上传加水印的方法实例代码：
<p><?php<br /> <br />/******************************************************************************<br /> <br />参数说明:<br />$max_file_size : 上传文件大小限制, 单位BYTE<br />$destination_folder : 上传文件路径<br />$watermark : 是否附加水印(1为加水印,其他为不加水印);<br /> <br />******************************************************************************/<br /> <br />//上传文件类型列表<br /> <br />$uptypes=array(<br /> 'image/jpg', <br /> 'image/jpeg',<br /> 'image/png',<br /> 'image/pjpeg',<br /> 'image/gif',<br /> 'image/bmp',<br /> 'image/x-png'<br />);<br /> <br /> <br />$max_file_size=2000000; //上传文件大小限制, 单位BYTE<br />$destination_folder="uploadimg/"; //上传文件路径<br />$watermark=1; //是否附加水印(1为加水印,其他为不加水印);<br />$watertype=1; //水印类型(1为文字,2为图片)<br />$waterposition=1; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);<br />$waterstring="http://www.xplore.cn/"; //水印字符串<br />$waterimg="xplore.gif"; //水印图片<br />$imgpreview=1; //是否生成预览图(1为生成,其他为不生成);<br />$imgpreviewsize=1/2; //缩略图比例<br /> <br />?><br /> <br /><html><br /><head><br /><title>ZwelL图片上传程序</title><br /><style type="text/css"><br /><!--<br />body<br />{ <br /> font-size: 9pt;<br />}<br />input<br />{ <br /> background-color: #66CCFF;<br /> border: 1px inset #CCCCCC;<br />}<br />--><br /></style><br /></head><br /><body><br /><form enctype="multipart/form-data" method="post" name="upform"><br /> 上传文件:<br /> <input name="upfile" type="file"><br /> <input type="submit" value="上传"><br><br /> 允许上传的文件类型为:<?=implode(', ',$uptypes)?><br /></form><br /><?php<br />if ($_SERVER['REQUEST_METHOD'] == 'POST')<br />{ <br /> if (!is_uploaded_file($_FILES["upfile"][tmp_name]))<br /> //是否存在文件<br /> { <br /> echo "图片不存在!";<br /> exit;<br /> }<br /> $file = $_FILES["upfile"];<br /> <br /> if($max_file_size < $file["size"])<br /> //检查文件大小<br /> { <br /> echo "文件太大!";<br /> exit;<br /> }<br /> <br /> if(!in_array($file["type"], $uptypes))<br /> //检查文件类型<br /> { <br /> echo "文件类型不符!".$file["type"];<br /> exit;<br /> }<br /> <br /> if(!file_exists($destination_folder))<br /> { <br /> mkdir($destination_folder);<br /> }<br /> <br /> $filename=$file["tmp_name"];<br /> $image_size = getimagesize($filename);<br /> $pinfo=pathinfo($file["name"]);<br /> $ftype=$pinfo['extension'];<br /> $destination = $destination_folder.time().".".$ftype;<br /> <br /> if (file_exists($destination) && $overwrite != true)<br /> { <br /> echo "同名文件已经存在了";<br /> exit;<br /> }<br /> <br /> if(!move_uploaded_file ($filename, $destination))<br /> { <br /> echo "移动文件出错";<br /> exit;<br /> }<br /> <br /> $pinfo=pathinfo($destination);<br /> $fname=$pinfo[basename];<br /> <br /> echo " < font color=red>已经成功上传</font><br>文件名: <font color= blue>".$destination_folder.$fname."</font><br>";<br /> echo " 宽度:".$image_size[0];<br /> echo " 长度:".$image_size[1];<br /> echo "<br> 大小:".$file["size"]." bytes";<br /> <br /> if($watermark==1)<br /> { <br /> $iinfo=getimagesize($destination,$iinfo);<br /> $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);<br /> $white=imagecolorallocate($nimage,255,255,255);<br /> $black=imagecolorallocate($nimage,0,0,0);<br /> $red=imagecolorallocate($nimage,255,0,0);<br /> imagefill($nimage,0,0,$white);<br /> switch ($iinfo[2])<br /> { <br /> case 1:<br /> $simage =imagecreatefromgif($destination);<br /> break;<br /> <br /> case 2:<br /> $simage =imagecreatefromjpeg($destination);<br /> break;<br /> <br /> case 3:<br /> $simage =imagecreatefrompng($destination);<br /> break;<br /> <br /> case 6:<br /> $simage =imagecreatefromwbmp($destination);<br /> break;<br /> <br /> default:<br /> die("不支持的文件类型");<br /> exit;<br /> }<br /> <br /> imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);<br /> imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);<br /> <br /> switch($watertype)<br /> { <br /> case 1: //加水印字符串<br /> imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);<br /> break;<br /> <br /> case 2: //加水印图片<br /> $simage1 =imagecreatefromgif("xplore.gif");<br /> imagecopy($nimage,$simage1,0,0,0,0,85,15);<br /> imagedestroy($simage1);<br /> break;<br /> }<br /> <br /> switch ($iinfo[2])<br /> { <br /> case 1:<br /> //imagegif($nimage, $destination);<br /> imagejpeg($nimage, $destination);<br /> break;<br /> <br /> case 2:<br /> imagejpeg($nimage, $destination);<br /> break;<br /> <br /> case 3:<br /> imagepng($nimage, $destination);<br /> break;<br /> <br /> case 6:<br /> imagewbmp($nimage, $destination);<br /> //imagejpeg($nimage, $destination);<br /> break;<br /> }<br /> <br /> //覆盖原上传文件<br /> imagedestroy($nimage);<br /> imagedestroy($simage);<br /> }<br /> <br /> if($imgpreview==1)<br /> { <br /> echo "<br>图片预览:<br>";<br /> echo "<img src=\"".$destination."\" style="max-width:90%" height=".($image_size[1]*$imgpreviewsize);<br / alt="PHP图片上传加水印方法代码" > echo " alt=\"图片预览:\r文件名:".$destination."\r上传时间:\">";<br /> }<br /> <br />}<br /> <br />?><br /></body><br /></html><br /></p><p></p>
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