imagescale

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

imagescale — Scale an image using the given new width and height

imagescale(
    GdImage $image,
    int $width,
    int $height = -1,
    int $mode = IMG_BILINEAR_FIXED
): GdImage|false

imagescale() scales an image using the given interpolation algorithm.

注意:
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 GdImage 对象。
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_FIXED or anything else (will use two pass).
注意: IMG_WEIGHTED4 is not yet supported.

Return the scaled image object on success 或者在失败时返回 false.

版本	说明
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 resource was expected.

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