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 = $this->orign_dirname." humb_".time()."_".$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; } } } $imgHandle = new Image_process("D:AppServwww estgetimg14061907445601.jpg"); //$imgHandle->waterMakeImage("D:AppServwww estgetimgshougongke.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 );}以上所述就是本文的全部内容了，希望大家能够喜欢。
