PHP上传图片进行等比缩放可增加水印功能 |
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本文标签：PHP,上传图片,等比缩放 啥也不说，直接上代码，大家可以自行添加增加水印功能： 复制代码 代码如下: <?php /** * * @author zhao jinhan * @date 2014年1月13日11:54:30 * @email xb_zjh@126.com * */ header(Content-type:text/html; charset=utf-8); //定义缩略图的宽高 define(THUMB_WIDTH,300); define(THUMB_HEIGHT,300); /** * 重新生成上传的文件名 * @return string * @author zhao jinhan * */ function _file_type($filetype = null){ switch($filetype) { case "image/jpeg": $fileextname = "jpg"; break; case "image/gif": $fileextname = "gif"; break; case "image/png": $fileextname = "png"; break; default: $fileextname = false; break; } return $fileextname?date(YmdHis,time())...$fileextname:false; } /** * * @param string $filename * @param string $width * @param string $height * @param string $quality * @param string $savepath * @return boolean */ function _make_thumb($filename=, $width=THUMB_WIDTH, $height=THUMB_HEIGHT, $savepath=./upload){ if(file_exists($filename)){ //上传图片的尺寸 $imagesize=getimagesize($filename); $imagewidth=$imagesize[0]; $imageheight=$imagesize[1]; $mime = $imagesize[mime]; //宽高比例 $ratio = $imagewidth/$imageheight; //新建一个背景图片 $bgimg = imagecreatetruecolor($width, $height); $white = imagecolorallocate($bgimg, 255, 255, 255); //填充背景色为白色 imagefill($bgimg,0,0,$white); if($mime == image/gif){ $im = @imagecreatefromgif($filename); /* Attempt to open */ $outfun = imagegif; }elseif($mime == image/png){ $im = @imagecreatefrompng($filename); /* Attempt to open */ $outfun = imagepng; }else{ $im = @imagecreatefromjpeg($filename); /* Attempt to open */ $outfun = imagejpeg; } if($ratio > 1){ //宽度较大 if($imagewidth > $width){ //缩放图片到背景图片上 $new_width = $width; $new_height = ($width*$imageheight)/$imagewidth; $bg_y = ceil(abs(($height-$new_height)/2)); imagecopyresampled($bgimg, $im, 0, $bg_y, 0, 0, $new_width, $new_height, $imagewidth, $imageheight); }else{ //复制图片到背景图片上 $copy = true; } }else{ //高度较大 if($imageheight > $height){ //缩放图片 $new_height = $height; $new_width = ($height*$imagewidth)/$imageheight; $bg_x = ceil(($width-$new_width)/2); imagecopyresampled($bgimg, $im, $bg_x, 0, 0, 0, $new_width, $new_height, $imagewidth, $imageheight); }else{ //复制图片到背景图片上 $copy = true; } } if($copy){ //复制图片到背景图片上 $bg_x = ceil(($width-$imagewidth)/2); $bg_y = ceil(($height-$imageheight)/2); imagecopy($bgimg, $im, $bg_x, $bg_y, 0, 0, $imagewidth, $imageheight); } $ext = _file_type($mime); $outfun($bgimg, $savepath./.$ext); imagedestroy($bgimg); return $savepath./.$ext; }else{ return false; } } if($_POST){ $size = $_POST[size]?strtoupper(trim($_POST[size])):2M; $imgsize = $_FILES[img][size]?$_FILES[img][size]/(1024*1024):0; $imgwidth = $imgheight = $_POST[width-height]?intval($_POST[width-height]):300; //自定定义文件上传大小 ini_set(upload_max_filesize,$size); $mathsize = str_replace(M,,$size); if($imgsize>$mathsize){ echo "图片大小不得超过{$size}!"; return; } if($file_name = _file_type($_FILES[img][type])){ if($_FILES[img][error] == UPLOAD_ERR_OK){ $savepath = upload/; if(!is_dir($savepath)){ mkdir($savepath,0644); } //生成缩略图 $thumb_file = _make_thumb($_FILES[img][tmp_name], $imgwidth, $imgheight, $savepath); //move_uploaded_file($_FILES[img][tmp_name],$savepath.$file_name); echo "生成后的图片为:<img src=".$thumb_file." />"; }else{ echo $_FILES[img][error]; return; } }else{ echo "图片格式不正确,请上传jpg,gif,png的格式!"; return; } }else{ echo <<<EOT <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>缩放图片保存成正方形</title> </head> <body> <form action="" method="POST" enctype="multipart/form-data"> <div> <label>上传一张图片:</label> <input type="file" name="img" /> </div> <div> <label>生成缩略图的宽高（单位px）:</label> <input type="text" name="width-height" value="300" /> </div> <div> <label>文件大小上限:</label> <input type="text" name="size" value="2M" /> </div> <div><input type="submit" name="submit" value="提交" /></div> </form> </body> </html> EOT; } |
