ConFoo 2025

imagescale

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

imagescaleScale an image using the given new width and height

说明

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.

参数

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.

返回值

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

错误/异常

Throws a ValueError if width or height would cause over-/underflow.

Throws a ValueError if mode is invalid.

更新日志

版本 说明
8.4.0 Now throws a ValueError if width or height would cause over-/underflow.
8.4.0 Now throws a ValueError if mode is invalid.
8.0.0 On success, this function returns a GDImage instance now; previously, a resource was returned.
8.0.0 image 现在需要 GdImage 实例;之前需要有效的 gd resource

参见

添加备注

用户贡献的备注 1 note

up
6
Anonymous
1 year ago
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
To Top