/**
* 压缩图片
* @param $imgsrc 图片路径
* @param string $imgdst 压缩后保存路径
* @param int $quality 压缩图片的质量
* @return string
*/
public function compressedImage($imgsrc, $imgdst="",$quality=75) {
//绝对路径 或者相对路径去掉前面的/
//if (!is_file($imgsrc))$imgsrc= __DIR__ . '/'.$imgsrc;
list($width, $height, $type) = getimagesize($imgsrc);
if ($imgdst==""){
$position1 = strrpos($imgsrc,'/');
$path1 = substr($imgsrc,0,$position1);
$name1=substr($imgsrc,$position1+1);
$imgdst=$path1."/thumb/".$name1;
// $arrtmp=explode("/",$imgsrc);
// array_splice($arrtmp, count($arrtmp)-1, 0, array("thumb"));
// $imgdst=implode("/",$arrtmp);
}
if (is_file($imgdst)){return $imgdst;}
$new_width = $width;//压缩后的图片宽
$new_height = $height;//压缩后的图片高
if($width >= 620){
$per = 620 / $width;//计算比例
$new_width = $width * $per;
$new_height = $height * $per;
}
//print_r($type);exit();
//创建文件交
$position = strrpos($imgdst,'/');
$path = substr($imgdst,0,$position);
if(!file_exists($path)){mkdir($path,0777,true);}
switch ($type) {
case 1:
$giftype = check_gifcartoon($imgsrc);
if ($giftype) {
//header('Content-Type:image/gif');
$image_wp = imagecreatetruecolor($new_width, $new_height);
/* --- 用以处理缩放gif和png图透明背景变黑色问题 开始 --- */
$color = imagecolorallocate($image_wp,255,255,255);
imagecolortransparent($image_wp,$color);
imagefill($image_wp,0,0,$color);
/* --- 用以处理缩放gif和png图透明背景变黑色问题 结束 --- */
$image = imagecreatefromgif($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, $quality);
imagedestroy($image_wp);
imagedestroy($image);
}
break;
case 2:
//header('Content-Type:image/jpeg');
$image_wp = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, $quality);
imagedestroy($image_wp);
imagedestroy($image);
break;
case 3:
//header('Content-Type:image/png');
$image_wp = imagecreatetruecolor($new_width, $new_height);
/* --- 用以处理缩放gif和png图透明背景变黑色问题 开始 --- */
$color = imagecolorallocate($image_wp,255,255,255);
imagecolortransparent($image_wp,$color);
imagefill($image_wp,0,0,$color);
/* --- 用以处理缩放gif和png图透明背景变黑色问题 结束 --- */
$image = imagecreatefrompng($imgsrc);
imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
//90代表的是质量、压缩图片容量大小
imagejpeg($image_wp, $imgdst, $quality);
imagedestroy($image_wp);
imagedestroy($image);
break;
}
return $imgdst;
}
