public function thumbimg($src_file, $target_width, $target_height,$start_x = 0, $start_y = 0,$times) {
$res['state']=0;//标志剪切是否成功
$res['msg']='';//返回剪切信息
$start_x*=$times;
$start_y*=$times;
$new_width=$target_width*$times;
$new_height=$target_height*$times;
$pathinfo = pathinfo($src_file);
$newfilename= uniqid(). '.' . $pathinfo['extension'];//产生的新文件名
//$dst_file = $pathinfo['dirname'] . '/' .$newfilename;
$dst_file ='./Public/tmp/' .$newfilename;
if ($target_width < 1 || $target_height < 1) {//如果新的宽度或高度非法
$res['msg']='宽度或高度非法';
return $res;
}
if (!file_exists($src_file)) {
$res['msg']='源文件不存在';
return $res;
}
// 图像类型
$img_type = exif_imagetype($src_file);
$support_type = array(IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF);
if (!in_array($img_type, $support_type, true)) {
$res['msg']='只支持jpg、png、gif格式';
return $res;
}
switch ($img_type) {
case IMAGETYPE_JPEG :
$src_img = imagecreatefromjpeg($src_file);
break;
case IMAGETYPE_PNG :
$src_img = imagecreatefrompng($src_file);
break;
case IMAGETYPE_GIF :
$src_img = imagecreatefromgif($src_file);
break;
default:
$res['msg']='载入图像错误!';
return $res;
}
$src_width = imagesx($src_img);
$src_height = imagesy($src_img);
$mid_width = ($src_width < $new_width) ? $src_width : $new_width;
$mid_height = ($src_height < $new_height) ? $src_height : $new_height;
// 为剪切图像创建背景画板
$mid_img = imagecreatetruecolor($mid_width, $mid_height);
//拷贝剪切的图像数据到画板，生成剪切图像
imagecopy($mid_img, $src_img, 0, 0, $start_x, $start_y, $mid_width, $mid_height);
// 为裁剪图像创建背景画板
$new_img = imagecreatetruecolor($target_width, $target_height);
//拷贝剪切图像到背景画板，并按比例裁剪
imagecopyresampled($new_img, $mid_img, 0, 0, 0, 0, $target_width, $target_height, $mid_width, $mid_height);
switch ($img_type) {
case IMAGETYPE_JPEG :
imagejpeg($new_img, $dst_file, 100);
break;
case IMAGETYPE_PNG :
imagepng($new_img, $dst_file, 9);
break;
case IMAGETYPE_GIF :
imagegif($new_img, $dst_file, 100);
break;
default:
break;
}
$res['state']=1;
$res['msg']=$dst_file;
return $res;
}
