一个正规的网站，在需要上传图片时，往往都会需要在图片上增加自己网站的logo水印。那么如何实现这一步骤呢？首先让我们来了解
通过判断文件类型建立图形，然后把其复制到原建立的图形上，填充并建立rectangle，以备写入imagestring()或是在原已经定好的图像程序当中判断水印类型：一是字符串，另是增加一个图形对象在上面。以下是PHP图片加水印的转载！
参数说明:
$max_file_size : 上传文件大小限制, 单位BYTE
$destination_folder : 上传文件路径
$watermark : 是否附加水印(1为加水印,其他为不加水印);
PHP图片加水印使用说明:
立即学习“PHP免费学习笔记（深入）”；
1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
2. 将extension_dir =改为你的php_gd2.dll所在目录;
PHP图片加水印的代码示例：
<ol class="dp-xml"><li class="alt"><span><span>//上传文件类型列表 </span></span></li><li><span>$</span><span class="attribute">uptypes</span><span>=</span><span class="attribute-value">array</span><span>( </span></li><li class="alt"><span>'image/jpg', </span></li><li><span>'image/jpeg', </span></li><li class="alt"><span>'image/png', </span></li><li><span>'image/pjpeg', </span></li><li class="alt"><span>'image/gif', </span></li><li><span>'image/bmp', </span></li><li class="alt"><span>'image/x-png' </span></li><li><span>); </span></li><li class="alt"><span>$</span><span class="attribute">max_file_size</span><span>=</span><span class="attribute-value">2000000</span><span>; //上传文件大小限制, 单位BYTE </span></li><li><span>$</span><span class="attribute">destination_folder</span><span>=</span><span class="attribute-value">"uploadimg/"</span><span>; //上传文件路径 </span></li><li class="alt"><span>$</span><span class="attribute">watermark</span><span>=</span><span class="attribute-value">1</span><span>; //是否附加水印(1为加水印,其他为不加水印); </span></li><li><span>$</span><span class="attribute">watertype</span><span>=</span><span class="attribute-value">1</span><span>; //水印类型(1为文字,2为图片) </span></li><li class="alt"><span>$</span><span class="attribute">waterposition</span><span>=</span><span class="attribute-value">1</span><span>; //水印位置(1为左下角,2为右下角 </span></li><li><span>,3为左上角,4为右上角,5为居中); </span></li><li class="alt"><span>$</span><span class="attribute">waterstring</span><span>="</span><span class="tag"><</span><span> </span><span class="tag-name">A</span><span> href="</span><span class="attribute-value">http</span><span>://www.xplore.cn/"</span><span class="tag">></span><span> </span></li><li><span>http://www.xplore.cn/</span><span class="tag"><</span><span> /A</span><span class="tag">></span><span>"; //水印字符串 </span></li><li class="alt"><span>$</span><span class="attribute">waterimg</span><span>=</span><span class="attribute-value">"xplore.gif"</span><span>; //水印图片 </span></li><li><span>$</span><span class="attribute">imgpreview</span><span>=</span><span class="attribute-value">1</span><span>; //是否生成预览图(1为生成,其他为不生成); </span></li><li class="alt"><span>$</span><span class="attribute">imgpreviewsize</span><span>=</span><span class="attribute-value">1</span><span>/2; //缩略图比例 </span></li><li><span class="tag">?></span><span> </span></li><li class="alt"><span class="tag"><</span><span> </span><span class="tag-name">html</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> </span><span class="tag-name">head</span><span class="tag">></span><span> </span></li><li class="alt"><span class="tag"><</span><span> </span><span class="tag-name">title</span><span class="tag">></span><span>ZwelL图片上传程序</span><span class="tag"></</span><span class="tag-name">title</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> </span><span class="tag-name">style</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"text/css"</span><span class="tag">></span><span> </span></li><li class="alt"><span><!-- </span></li><li><span>body </span></li><li class="alt"><span>{ </span></li><li><span>font-size: 9pt; </span></li><li class="alt"><span>} </span></li><li><span>input </span></li><li class="alt"><span>{ </span></li><li><span>background-color: #66CCFF; </span></li><li class="alt"><span>border: 1px inset #CCCCCC; </span></li><li><span>} </span></li><li class="alt"><span>--</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> /style</span><span class="tag">></span><span> </span></li><li class="alt"><span class="tag"><</span><span> /head</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> </span><span class="tag-name">body</span><span class="tag">></span><span> </span></li><li class="alt"><span class="tag"><</span><span> </span><span class="tag-name">form</span><span> </span><span class="attribute">enctype</span><span>=</span><span class="attribute-value">"multipart/form-data"</span><span> </span></li><li><span class="attribute">method</span><span>=</span><span class="attribute-value">"post"</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"upform"</span><span class="tag">></span><span> </span></li><li class="alt"><span>上传文件: </span></li><li><span class="tag"><</span><span class="tag-name">input</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"upfile"</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"file"</span><span class="tag">></span><span> </span></li><li class="alt"><span class="tag"><</span><span> </span><span class="tag-name">input</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"submit"</span><span> </span><span class="attribute">value</span><span>=</span><span class="attribute-value">"上传"</span><span class="tag">></span><span class="tag"><</span><span> </span><span class="tag-name">br</span><span class="tag">></span><span> </span></li><li><span>允许上传的文件类型为:</span><span class="tag"><?</span><span>=implode(', ',$uptypes)</span><span class="tag">?></span><span> </span></li><li class="alt"><span class="tag"><</span><span> /form</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> ?php </span></li><li class="alt"><span>if ($_SERVER['REQUEST_METHOD'] == 'POST') </span></li><li><span>{ </span></li><li class="alt"><span>if (!is_uploaded_file($_FILES["upfile"] </span></li><li><span>[tmp_name])) </span></li><li class="alt"><span>//是否存在文件 </span></li><li><span>{ </span></li><li class="alt"><span>echo "图片不存在!"; </span></li><li><span>exit; </span></li><li class="alt"><span>} </span></li><li><span>$</span><span class="attribute">file</span><span> = $_FILES["upfile"]; </span></li><li class="alt"><span>if($max_file_size </span><span class="tag"><</span><span> $file["size"]) </span></li><li><span>//检查文件大小 </span></li><li class="alt"><span>{ </span></li><li><span>echo "文件太大!"; </span></li><li class="alt"><span>exit; </span></li><li><span>} </span></li><li class="alt"><span>if(!in_array($file["type"], $uptypes)) </span></li><li><span>//检查文件类型 </span></li><li class="alt"><span>{ </span></li><li><span>echo "文件类型不符!".$file["type"]; </span></li><li class="alt"><span>exit; </span></li><li><span>} </span></li><li class="alt"><span>if(!file_exists($destination_folder)) </span></li><li><span>{ </span></li><li class="alt"><span>mkdir($destination_folder); </span></li><li><span>} </span></li><li class="alt"><span>$</span><span class="attribute">filename</span><span>=$file["tmp_name"]; </span></li><li><span>$</span><span class="attribute">image_size</span><span> = </span><span class="attribute-value">getimagesize</span><span>($filename); </span></li><li class="alt"><span>$</span><span class="attribute">pinfo</span><span>=</span><span class="attribute-value">pathinfo</span><span>($file["name"]); </span></li><li><span>$</span><span class="attribute">ftype</span><span>=$pinfo['extension']; </span></li><li class="alt"><span>$</span><span class="attribute">destination</span><span> = $destination_folder. </span></li><li><span>time().".".$ftype; </span></li><li class="alt"><span>if (file_exists($destination) && </span></li><li><span> $overwrite != true) </span></li><li class="alt"><span>{ </span></li><li><span>echo "同名文件已经存在了"; </span></li><li class="alt"><span>exit; </span></li><li><span>} </span></li><li class="alt"><span>if(!move_uploaded_file ($filename, </span></li><li><span> $destination)) </span></li><li class="alt"><span>{ </span></li><li><span>echo "移动文件出错"; </span></li><li class="alt"><span>exit; </span></li><li><span>} </span></li><li class="alt"><span>$</span><span class="attribute">pinfo</span><span>=</span><span class="attribute-value">pathinfo</span><span>($destination); </span></li><li><span>$</span><span class="attribute">fname</span><span>=$pinfo[basename]; </span></li><li class="alt"><span>echo " </span><span class="tag"><</span><span class="tag-name">font</span><span> </span><span class="attribute">color</span><span>=</span><span class="attribute-value">red</span><span class="tag">></span><span>已经成功上传 </span></li><li><span class="tag"><</span><span> /font</span><span class="tag">></span><span class="tag"><</span><span class="tag-name">br</span><span class="tag">></span><span>文件名: </span></li><li class="alt"><span class="tag"><</span><span> </span><span class="tag-name">font</span><span> </span><span class="attribute">color</span><span>=</span><span class="attribute-value">blue</span><span class="tag">></span><span>".$destination_folder. </span></li><li><span>$fname."</span><span class="tag"><</span><span> /font</span><span class="tag">></span><span class="tag"><</span><span> </span><span class="tag-name">br</span><span class="tag">></span><span>"; </span></li><li class="alt"><span>echo " 宽度:".$image_size[0]; </span></li><li><span>echo " 长度:".$image_size[1]; </span></li><li class="alt"><span>echo "</span><span class="tag"><</span><span class="tag-name">br</span><span class="tag">></span><span> 大小:".$file["size"]." bytes"; </span></li><li><span>if($</span><span class="attribute">watermark</span><span>==1) </span></li><li class="alt"><span>{ </span></li><li><span>$</span><span class="attribute">iinfo</span><span>=</span><span class="attribute-value">getimagesize</span><span>($destination,$iinfo); </span></li><li class="alt"><span>$</span><span class="attribute">nimage</span><span>=</span><span class="attribute-value">imagecreatetruecolor</span><span>($image_size[0] </span></li><li><span>,$image_size[1]); </span></li><li class="alt"><span>$</span><span class="attribute">white</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($nimage,255,255,255); </span></li><li><span>$</span><span class="attribute">black</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($nimage,0,0,0); </span></li><li class="alt"><span>$</span><span class="attribute">red</span><span>=</span><span class="attribute-value">imagecolorallocate</span><span>($nimage,255,0,0); </span></li><li><span>imagefill($nimage,0,0,$white); </span></li><li class="alt"><span>switch ($iinfo[2]) </span></li><li><span>{ </span></li><li class="alt"><span>case 1: </span></li><li><span>$</span><span class="attribute">simage</span><span> =</span><span class="attribute-value">imagecreatefromgif</span><span>($destination); </span></li><li class="alt"><span>break; </span></li><li><span>case 2: </span></li><li class="alt"><span>$</span><span class="attribute">simage</span><span> =</span><span class="attribute-value">imagecreatefromjpeg</span><span>($destination); </span></li><li><span>break; </span></li><li class="alt"><span>case 3: </span></li><li><span>$</span><span class="attribute">simage</span><span> =</span><span class="attribute-value">imagecreatefrompng</span><span>($destination); </span></li><li class="alt"><span>break; </span></li><li><span>case 6: </span></li><li class="alt"><span>$</span><span class="attribute">simage</span><span> =</span><span class="attribute-value">imagecreatefromwbmp</span><span>($destination); </span></li><li><span>break; </span></li><li class="alt"><span>default: </span></li><li><span>die("不支持的文件类型"); </span></li><li class="alt"><span>exit; </span></li><li><span>} </span></li><li class="alt"><span>imagecopy($nimage,$simage,0,0,0,0, </span></li><li><span>$image_size[0],$image_size[1]); </span></li><li class="alt"><span>imagefilledrectangle($nimage,1, </span></li><li><span>$image_size[1]-15,80,$image_size[1],$white); </span></li><li class="alt"><span>switch($watertype) </span></li><li><span>{ </span></li><li class="alt"><span>case 1: //加水印字符串 </span></li><li><span>imagestring($nimage,2,3,$image_size[1]-15, </span></li><li class="alt"><span>$waterstring,$black); </span></li><li><span>break; </span></li><li class="alt"><span>case 2: //加水印图片 </span></li><li><span>$</span><span class="attribute">simage1</span><span> =</span><span class="attribute-value">imagecreatefromgif</span><span>("xplore.gif"); </span></li><li class="alt"><span>imagecopy($nimage,$simage1,0,0,0,0,85,15); </span></li><li><span>imagedestroy($simage1); </span></li><li class="alt"><span>break; </span></li><li><span>} </span></li><li class="alt"><span>switch ($iinfo[2]) </span></li><li><span>{ </span></li><li class="alt"><span>case 1: </span></li><li><span>//imagegif($nimage, $destination); </span></li><li class="alt"><span>imagejpeg($nimage, $destination); </span></li><li><span>break; </span></li><li class="alt"><span>case 2: </span></li><li><span>imagejpeg($nimage, $destination); </span></li><li class="alt"><span>break; </span></li><li><span>case 3: </span></li><li class="alt"><span>imagepng($nimage, $destination); </span></li><li><span>break; </span></li><li class="alt"><span>case 6: </span></li><li><span>imagewbmp($nimage, $destination); </span></li><li class="alt"><span>//imagejpeg($nimage, $destination); </span></li><li><span>break; </span></li><li class="alt"><span>} </span></li><li><span>//覆盖原上传文件 </span></li><li class="alt"><span>imagedestroy($nimage); </span></li><li><span>imagedestroy($simage); </span></li><li class="alt"><span>} </span></li><li><span>if($</span><span class="attribute">imgpreview</span><span>==1) </span></li><li class="alt"><span>{ </span></li><li><span>echo "</span><span class="tag"><</span><span> </span><span class="tag-name">br</span><span class="tag">></span><span>图片预览:</span><span class="tag"><</span><span class="tag-name">br</span><span class="tag">></span><span>"; </span></li><li class="alt"><span>echo "</span><span class="tag"><</span><span> </span><span class="tag-name">ccid_file</span><span> </span><span class="attribute">values</span><span>=</span><span class="attribute-value">""</span><span> </span><span class="attribute">width</span><span>=". </span></li><li><span>($image_size[0]*$imgpreviewsize)." </span></li><li class="alt"><span class="attribute">height</span><span>=</span><span class="attribute-value">".($image_size[1]*$imgpreviewsize);"</span><span> </span></li><li><span>echo " </span><span class="attribute">alt</span><span>="图片预览:r文件名:". </span></li><li class="alt"><span>$destination."r上传时间:" </span><span class="tag">/></span><span>"; </span></li><li><span>} </span></li><li class="alt"><span>} </span></li><li><span class="tag">?></span><span> </span></li><li class="alt"><span class="tag"><</span><span> /body</span><span class="tag">></span><span> </span></li><li><span class="tag"><</span><span> /html</span><span class="tag">></span><span> </span></li></ol>以上这段代码范例就是PHP图片加水印的具体实现方法。
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