Seemingly, you can't omit the width the same way you do with the height. If you write -1 for the width and specify a number for the height it will return false
imagescale
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
imagescale — Scale an image using the given new width and height
Description
imagescale(
GdImage
int
int
int
): GdImage|false
GdImage
$image,int
$width,int
$height = -1,int
$mode = IMG_BILINEAR_FIXED): GdImage|false
imagescale() 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.
Parameters
-
image -
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
-
width -
The width to scale the image to.
-
height -
The height to scale the image to. If omitted or negative, the aspect ratio will be preserved.
-
mode -
One of
IMG_NEAREST_NEIGHBOUR,IMG_BILINEAR_FIXED,IMG_BICUBIC,IMG_BICUBIC_FIXEDor anything else (will use two pass).Note:
IMG_WEIGHTED4is not yet supported.
Return Values
Return the scaled image object on success or false on failure.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | On success, this function returns a GDImage instance now; previously, a resource was returned. |
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
See Also
- imagecopyresized() - Copy and resize part of an image
- imagecopyresampled() - Copy and resize part of an image with resampling
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