(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锟斤拷图锟襟创斤拷锟斤拷锟斤拷(锟斤拷锟斤拷imagecreatetruecolor())锟斤拷锟截碉拷图锟斤拷锟斤拷源锟斤拷
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 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE.
| 锟芥本 | 说锟斤拷 |
|---|---|
| 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() - 锟斤拷锟斤拷锟斤拷锟斤拷图锟今并碉拷锟斤拷锟斤拷小 imagecopyresampled() - 锟截诧拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷图锟今并碉拷锟斤拷锟斤拷小