百科狗imagescale() - gd函数（图像处理）
imagescale()
(PHP 5 >= 5.5.0, PHP 7)
Scale an image using the given new width and height
说明
imagescale(resource $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, anewimage is returned.
参数
$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.
CautionYou 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.
$mode One of IMG_NEAREST_NEIGHBOUR,IMG_BILINEAR_FIXED,IMG_BICUBIC,IMG_BICUBIC_FIXED or anything else(will use two pass).
Note:IMG_WEIGHTED4 is not yet supported.
返回值
Return the scaled image resource on success 或者在失败时返回FALSE.
更新日志
| 版本 | 说明 |
|---|---|
| 5.5.19/5.6.3 | The calculation of the height if$new_heightwas negative or omitted was fixed; prior to these versions, the aspect ratio was not maintained correctly. |
参见
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
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