<img src="/UploadFiles/2021-04-02/thumbs.php">

此代码可以为大图片动态生成缩略图显示，图片在内存中生成，不在硬盘生成真实文件
thumbs.php文件如下：


<"http://localhost/images/"; //finish in "/"
// Content type
header('Content-type: image/jpeg');
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($path.$filename);
if ($width && ($width_orig < $height_orig)) {
  $width = ($height / $height_orig) * $width_orig;
} else {
  $height = ($width / $width_orig) * $height_orig;
}
// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($path.$filename);
imagecopyresampled($image_p,$image,0,0,0,0,$width,$height,$width_orig,$height_orig);
// Output
imagejpeg($image_p, null, 100);
// Imagedestroy
imagedestroy ($image_p);
?>


希望本文所述对大家的php程序设计有所帮助。