常用的php图片处理类（水印、等比缩放、固定高宽）分享
<?php //PHP 添加水印 & 比例缩略图 & 固定高度 & 固定宽度 类。 class Image_process{ public $source; //原图 public $source_width; //原图宽度 public $source_height; //原图高度 public $source_type_id; public $orign_name; public $orign_dirname; //传入原图路径 public function __construct($source){ $this->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：
<?php /** * * 图像处理类 * @author FC_LAMP * @internal功能包含：水印,缩略图 */ class Img { //图片格式 private $exts = array ('jpg', 'jpeg', 'gif', 'bmp', 'png' ); /** * * * @throws Exception */ public function __construct() { if (! function_exists ( 'gd_info' )) { throw new Exception ( '加载GD库失败！' ); } } /** * * 裁剪压缩 * @param $src_img 图片 * @param $save_img 生成后的图片 * @param $option 参数选项，包括： $maxwidth 宽 $maxheight 高 * array('width'=>xx,'height'=>xxx) * @internal * 我们一般的压缩图片方法，在图片过长或过宽时生成的图片 * 都会被“压扁”，针对这个应采用先裁剪后按比例压缩的方法 */ public function thumb_img($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 < $heightratio) $ratio = $widthratio; else $ratio = $heightratio; } if ($resizewidth_tag && ! $resizeheight_tag) $ratio = $widthratio; if ($resizeheight_tag && ! $resizewidth_tag) $ratio = $heightratio; $newwidth = $src_w * $ratio; $newheight = $src_h * $ratio; if (function_exists ( "imagecopyresampled" )) { $newim = imagecreatetruecolor ( $newwidth, $newheight ); imagecopyresampled ( $newim, $source, 0, 0, 0, 0, $newwidth, $newheight, $src_w, $src_h ); } else { $newim = imagecreate ( $newwidth, $newheight ); imagecopyresized ( $newim, $source, 0, 0, 0, 0, $newwidth, $newheight, $src_w, $src_h ); } } //输出(保存)图片 if (! empty ( $save_img )) { $org_funcs ['save_func'] ( $newim, $save_img ); } else { header ( $org_funcs ['header'] ); $org_funcs ['save_func'] ( $newim ); } imagedestroy ( $newim ); return array ('flag' => 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 < 0) ? $x : $org_img_im_x; $y = $org_img_h - $mark_img_h; $org_img_im_y = isset ( $option ['y'] ) ? $option ['y'] : $y; $org_img_im_y = ($org_img_im_y > $org_img_h or $org_img_im_y < 0) ? $y : $org_img_im_y; //alpha $alpha = isset ( $option ['alpha'] ) ? $option ['alpha'] : 50; $alpha = ($alpha > 100 or $alpha < 0) ? 50 : $alpha; //合并图片 imagecopymerge ( $org_img_im, $mark_img_im, $org_img_im_x, $org_img_im_y, $mark_img_im_x, $mark_img_im_y, $mark_img_w, $mark_img_h, $alpha ); //输出(保存)图片 if (! empty ( $save_img )) { $org_funcs ['save_func'] ( $org_img_im, $save_img ); } else { header ( $org_funcs ['header'] ); $org_funcs ['save_func'] ( $org_img_im ); } //销毁画布 imagedestroy ( $org_img_im ); imagedestroy ( $mark_img_im ); return array ('flag' => 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 ); }