php - 放大图片？

Question

//Get current dimensions
$width = imagesx($myimage);
$height = imagesy($myimage);

$width = $width * ($zoom/100);
$height = $height * ($zoom/100);

$scale = min($new_width/$width, $new_height/$height);

$new_width = ceil($scale * $width);
$new_height = ceil($scale * $height);




    imagecopyresampled($image_p, $myimage, 0, 0, $offset_x * -1, $offset_y * -1, $new_width, $new_height, $width, $height);

我正在尝试缩放图片，但实际上它变得更小并且根本没有缩放。缩放是一个像 113/100 = 1.13 这样的因子，应该放大 13%。

Answer 1

我猜你想要的是：

//Get current dimensions
$width = imagesx($myimage);
$height = imagesy($myimage);

$new_width = $width * $zoom / 100; //120 zoom will increase the image by 20%
$new_height = $height * $zoom / 100;

imagecopyresampled($image_p, $myimage, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

实际上 php.net 上的第一个示例是缩放示例： http: //php.net/manual/en/function.imagecopyresampled.php