(PHP 7 >= 7.2.0, PHP 8)
imagesetclip — Set the clipping rectangle
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 GdImage 对象。
x1
The x-coordinate of the upper left corner.
y1
The y-coordinate of the upper left corner.
x2
The x-coordinate of the lower right corner.
y2
The y-coordinate of the lower right corner.