php实现等比例压缩图片

本文实例为大家分享了php实现等比例压缩图片的具体代码，供大家参考，具体内容如下

  public function compressedImage($imgsrc, $imgdst) {
    list($width, $height, $type) = getimagesize($imgsrc);
    
    $new_width = $width;//压缩后的图片宽
    $new_height = $height;//压缩后的图片高
 
    if($width >= 600){
      $per = 600 / $width;//计算比例
      $new_width = $width * $per;
      $new_height = $height * $per;
    }
    
    switch ($type) {
      case 1:
 $giftype = check_gifcartoon($imgsrc);
 if ($giftype) {
   header('Content-Type:image/gif');
   $image_wp = imagecreatetruecolor($new_width, $new_height);
   $image = imagecreatefromgif($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, $imgdst, 90);
   imagedestroy($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, $imgdst, 90);
 imagedestroy($image_wp);
 imagedestroy($image);
 break;
      case 3:
 header('Content-Type:image/png');
 $image_wp = imagecreatetruecolor($new_width, $new_height);
 $image = imagecreatefrompng($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, $imgdst, 90);
 imagedestroy($image_wp);
 imagedestroy($image);
 break;
    }
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。