这篇文章主要汇总介绍了两个常用的php图片处理类（水
常用的php图片处理类（水印、等比缩放、固定高宽）分享
typelist = array(1=>'gif',2=>'jpg',3=>'png');$ginfo = getimagesize($source);$this->source_width = $ginfo[0];$this->source_height = $ginfo[1];$this->source_type_id = $ginfo[2];$this->orign_url = $source;$this->orign_name = basename($source);$this->orign_dirname = dirname($source);}//判断图片的文件的格式，返回php可识别的编码public function judgetype($type,$source){if($type == 1){return imagecreatefromgif($source); //gif}else if($type == 2){return imagecreatefromjpeg($source); //jpg}else if($type == 3){return imagecreatefrompng($source); //png}else{return false;}}//生成水印图片public function watermakeimage($logo){$linfo = getimagesize($logo);$logo_width = $linfo[0];$logo_height = $linfo[1];$logo_type_id = $linfo[2];$sourcehandle = $this->judgetype($this->source_type_id,$this->orign_url);$logohandle = $this->judgetype($logo_type_id,$logo);if(!$sourcehandle || !$logohandle){return false;}$x = ($this->source_width - $logo_width)/2;$y = ($this->source_height - $logo_height)/2;imagecopy($sourcehandle,$logohandle,$x,$y,0,0,$logo_width,$logo_height);$newpic = $this->orign_dirname.'\water_'.time().'.'.$this->typelist[$this->source_type_id];if($this->saveimage($sourcehandle,$newpic)){imagedestroy($sourcehandle);imagedestroy($logohandle);}}//固定高度宽度public function fixsizeimage($width,$height){if($width > $this->source_width) $this->source_width;if($height > $this->source_height) $this->source_height;if($width === false){$width = floor($this->source_width / ($this->source_height / $height));}if($height === false){$height = floor($this->source_height / ($this->source_width / $width));}$this->tinyimage($width,$height);}//等比例缩放图片public function scaleimage($scale){$width = floor($this->source_width * $scale);$height = floor($this->source_height * $scale);$this->tinyimage($width, $height);}//创建缩略图public function tinyimage($width,$height){$tinyimage = imagecreatetruecolor($width,$height);$handle = $this->judgetype($this->source_type_id,$this->orign_url);if(function_exists('imagecopyresampled')){imagecopyresampled($tinyimage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height);}else{imagecopyresized($tinyimage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height);}$newpic = $this->orign_dirname.'\thumb_'.time().'_'.$width._.$height...$this->typelist[$this->source_type_id];if($this->saveimage($tinyimage,$newpic)){imagedestroy($tinyimage);imagedestroy($handle);}}//保存图片private function saveimage($image,$url){if(imagejpeg($image,$url)){return true;}} } $imghandle = new image_process('d:\appserv\www\test\getimg\14061907445601.jpg'); //$imghandle->watermakeimage('d:\appserv\www\test\getimg\shougongke.png'); //生成水印图片 //$imghandle->fixsizeimage(200,150); //固定长度图片 $imghandle->scaleimage(0.2); //等比例缩放 ?>
示例二：
xx,'height'=>xxx) * @internal * 我们一般的压缩图片方法，在图片过长或过宽时生成的图片 * 都会被“压扁”，针对这个应采用先裁剪后按比例压缩的方法 */ public function thumb_img($src_img, $save_img = '', $option) {if (empty ( $option ['width'] ) or empty ( $option ['height'] )) { return array ('flag' => false, 'msg' => '原图长度与宽度不能小于0' ); } $org_ext = $this->is_img ( $src_img ); if (! $org_ext ['flag']) { return $org_ext; }//如果有保存路径，则确定路径是否正确 if (! empty ( $save_img )) { $f = $this->check_dir ( $save_img ); if (! $f ['flag']) { return $f; } }//获取出相应的方法 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] );//获取原大小 $source = $org_funcs ['create_func'] ( $src_img ); $src_w = imagesx ( $source ); $src_h = imagesy ( $source );//调整原始图像(保持图片原形状裁剪图像) $dst_scale = $option ['height'] / $option ['width']; //目标图像长宽比 $src_scale = $src_h / $src_w; // 原图长宽比 if ($src_scale >= $dst_scale) { // 过高 $w = intval ( $src_w ); $h = intval ( $dst_scale * $w );$x = 0; $y = ($src_h - $h) / 3; } else { // 过宽 $h = intval ( $src_h ); $w = intval ( $h / $dst_scale );$x = ($src_w - $w) / 2; $y = 0; } // 剪裁 $croped = imagecreatetruecolor ( $w, $h ); imagecopy ( $croped, $source, 0, 0, $x, $y, $src_w, $src_h ); // 缩放 $scale = $option ['width'] / $w; $target = imagecreatetruecolor ( $option ['width'], $option ['height'] ); $final_w = intval ( $w * $scale ); $final_h = intval ( $h * $scale ); imagecopyresampled ( $target, $croped, 0, 0, 0, 0, $final_w, $final_h, $w, $h ); imagedestroy ( $croped );//输出(保存)图片 if (! empty ( $save_img )) {$org_funcs ['save_func'] ( $target, $save_img ); } else { header ( $org_funcs ['header'] ); $org_funcs ['save_func'] ( $target ); } imagedestroy ( $target ); return array ('flag' => true, 'msg' => '' ); }/** * * 等比例缩放图像 * @param $src_img 原图片 * @param $save_img 需要保存的地方 * @param $option 参数设置 array('width'=>xx,'height'=>xxx) * */ function resize_image($src_img, $save_img = '', $option) { $org_ext = $this->is_img ( $src_img ); if (! $org_ext ['flag']) { return $org_ext; }//如果有保存路径，则确定路径是否正确 if (! empty ( $save_img )) { $f = $this->check_dir ( $save_img ); if (! $f ['flag']) { return $f; } }//获取出相应的方法 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] );//获取原大小 $source = $org_funcs ['create_func'] ( $src_img ); $src_w = imagesx ( $source ); $src_h = imagesy ( $source );if (($option ['width'] && $src_w > $option ['width']) || ($option ['height'] && $src_h > $option ['height'])) { if ($option ['width'] && $src_w > $option ['width']) { $widthratio = $option ['width'] / $src_w; $resizewidth_tag = true; }if ($option ['height'] && $src_h > $option ['height']) { $heightratio = $option ['height'] / $src_h; $resizeheight_tag = true; }if ($resizewidth_tag && $resizeheight_tag) { if ($widthratio true, 'msg' => '' ); }/** * * 生成水印图片 * @param $org_img 原图像 * @param $mark_img 水印标记图像 * @param $save_img 当其目录不存在时，会试着创建目录 * @param array $option 为水印的一些基本设置包含： * x:水印的水平位置,默认为减去水印图宽度后的值 * y:水印的垂直位置,默认为减去水印图高度后的值 * alpha:alpha值(控制透明度),默认为50 */ public function water_mark($org_img, $mark_img, $save_img = '', $option = array()) { //检查图片 $org_ext = $this->is_img ( $org_img ); if (! $org_ext ['flag']) { return $org_ext; } $mark_ext = $this->is_img ( $mark_img ); if (! $mark_ext ['flag']) { return $mark_ext; } //如果有保存路径，则确定路径是否正确 if (! empty ( $save_img )) { $f = $this->check_dir ( $save_img ); if (! $f ['flag']) { return $f; } }//获取相应画布 $org_funcs = $this->get_img_funcs ( $org_ext ['msg'] ); $org_img_im = $org_funcs ['create_func'] ( $org_img );$mark_funcs = $this->get_img_funcs ( $mark_ext ['msg'] ); $mark_img_im = $mark_funcs ['create_func'] ( $mark_img );//拷贝水印图片坐标 $mark_img_im_x = 0; $mark_img_im_y = 0; //拷贝水印图片高宽 $mark_img_w = imagesx ( $mark_img_im ); $mark_img_h = imagesy ( $mark_img_im );$org_img_w = imagesx ( $org_img_im ); $org_img_h = imagesx ( $org_img_im );//合成生成点坐标 $x = $org_img_w - $mark_img_w; $org_img_im_x = isset ( $option ['x'] ) ? $option ['x'] : $x; $org_img_im_x = ($org_img_im_x > $org_img_w or $org_img_im_x $org_img_h or $org_img_im_y 100 or $alpha true, 'msg' => '' );}/** * * 检查图片 * @param unknown_type $img_path * @return array('flag'=>true/false,'msg'=>ext/错误信息) */ private function is_img($img_path) { if (! file_exists ( $img_path )) { return array ('flag' => false, 'msg' => 加载图片 $img_path 失败！ ); } $ext = explode ( '.', $img_path ); $ext = strtolower ( end ( $ext ) ); if (! in_array ( $ext, $this->exts )) { return array ('flag' => false, 'msg' => 图片 $img_path 格式不正确！ ); } return array ('flag' => true, 'msg' => $ext ); }/** * * 返回正确的图片函数 * @param unknown_type $ext */ private function get_img_funcs($ext) { //选择 switch ($ext) { case 'jpg' : $header = 'content-type:image/jpeg'; $createfunc = 'imagecreatefromjpeg'; $savefunc = 'imagejpeg'; break; case 'jpeg' : $header = 'content-type:image/jpeg'; $createfunc = 'imagecreatefromjpeg'; $savefunc = 'imagejpeg'; break; case 'gif' : $header = 'content-type:image/gif'; $createfunc = 'imagecreatefromgif'; $savefunc = 'imagegif'; break; case 'bmp' : $header = 'content-type:image/bmp'; $createfunc = 'imagecreatefrombmp'; $savefunc = 'imagebmp'; break; default : $header = 'content-type:image/png'; $createfunc = 'imagecreatefrompng'; $savefunc = 'imagepng'; } return array ('save_func' => $savefunc, 'create_func' => $createfunc, 'header' => $header ); }/** * * 检查并试着创建目录 * @param $save_img */ private function check_dir($save_img) { $dir = dirname ( $save_img ); if (! is_dir ( $dir )) { if (! mkdir ( $dir, 0777, true )) { return array ('flag' => false, 'msg' => 图片保存目录 $dir 无法创建！ ); } } return array ('flag' => true, 'msg' => '' ); }}if (! empty ( $_files ['test'] ['tmp_name'] )){ //例子 $img = new img (); //原图 $name = explode ( '.', $_files ['test'] ['name'] ); $org_img = 'd:/test.' . end ( $name ); move_uploaded_file ( $_files ['test'] ['tmp_name'], $org_img ); $option = array ('width' => $_post ['width'], 'height' => $_post ['height'] ); if ($_post ['type'] == 1) { $s = $img->resize_image ( $org_img, '', $option ); } else { $img->thumb_img ( $org_img, '', $option ); } unlink ( $org_img );}
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