(PHP 5 >= 5.5.0, PHP 7)
imagescale — Scale an image using the given new width and height
$image
, int $new_width
[, int $new_height = -1
[, int $mode = IMG_BILINEAR_FIXED
]] ) : resourceimagescale() scales an image using the given interpolation algorithm.
Note:
Unlike many of other image functions, imagescale() does not modify the passed
image; instead, a new image is returned.
image由图象创建函数(例如imagecreatetruecolor())返回的图象资源。
new_widthThe width to scale the image to.
new_heightThe height to scale the image to. If omitted or negative, the aspect ratio will be preserved.
You should always provide the height if using PHP 5.5.18 or earlier, or PHP 5.6.2 or earlier, as the aspect ratio calculation was incorrect.
mode
One of IMG_NEAREST_NEIGHBOUR,
IMG_BILINEAR_FIXED,
IMG_BICUBIC,
IMG_BICUBIC_FIXED or anything else (will use two
pass).
Note:
IMG_WEIGHTED4is not yet supported.
Return the scaled image resource on success 或者在失败时返回 FALSE.
| 版本 | 说明 |
|---|---|
| 5.5.19/5.6.3 |
The calculation of the height if new_height was
negative or omitted was fixed; prior to these versions, the aspect
ratio was not maintained correctly.
|
imagecopyresized() - 拷贝部分图像并调整大小 imagecopyresampled() - 重采样拷贝部分图像并调整大小