(PHP 7.2)
imagesetclip — Set the clipping rectangle
$im
, int $x1
, int $y1
, int $x2
, int $y2
)imagesetclip() sets the current clipping rectangle, i.e. the area beyond which no pixels will be drawn.
image由图象创建函数(例如imagecreatetruecolor())返回的图象资源。
x1The x-coordinate of the upper left corner.
y1The y-coordinate of the upper left corner.
x2The x-coordinate of the lower right corner.
y2The y-coordinate of the lower right corner.
成功时返回 TRUE， 或者在失败时返回 FALSE。