以下是动态调整图像大小的示例函数。您可以使用自己的特定宽度/高度或从 get 变量中获取。
function CroppedThumbnail($imgSrc,$thumbnail_width,$thumbnail_height) { //$imgSrc is a FILE - Returns an image resource.
//getting the image dimensions
list($width_orig, $height_orig) = getimagesize($imgSrc);
$myImage = imagecreatefromjpeg($imgSrc);
$ratio_orig = $width_orig/$height_orig;
if ($thumbnail_width/$thumbnail_height > $ratio_orig) {
$new_height = $thumbnail_width/$ratio_orig;
$new_width = $thumbnail_width;
} else {
$new_width = $thumbnail_height*$ratio_orig;
$new_height = $thumbnail_height;
}
$x_mid = $new_width/2; //horizontal middle
$y_mid = $new_height/2; //vertical middle
$process = imagecreatetruecolor(round($new_width), round($new_height));
imagecopyresampled($process, $myImage, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
$thumb = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresampled($thumb, $process, 0, 0, ($x_mid-($thumbnail_width/2)), ($y_mid-($thumbnail_height/2)), $thumbnail_width, $thumbnail_height, $thumbnail_width, $thumbnail_height);
imagedestroy($process);
imagedestroy($myImage);
return $thumb;
}
//Create the thumbnail
$newThumb = CroppedThumbnail("DSC01088.jpg",$_GET['width'],$_GET['height']);
// And display the image...
header('Content-type: image/jpeg');
imagejpeg($newThumb);