[int|null$resolution_x = null],
[int|null$resolution_y = null]
imageresolution allows to set and get the resolution of an image in DPI (dots per inch). If the optional parameters are null, the current resolution is returned as an indexed array. If only resolution_x is not null, the horizontal and vertical resolution are set to this value. If none of the optional parameters are null, the horizontal and vertical resolution are set to these values, respectively.
The resolution is only used as meta information when images are read from and written to formats supporting this kind of information (curently PNG and JPEG). It does not affect any drawing operations. The default resolution for new images is 96 DPI.
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
The horizontal resolution in DPI.
The vertical resolution in DPI.
When used as getter, it returns an indexed array of the horizontal and vertical resolution on success, or false on failure. When used as setter, it returns true on success, or false on failure.
|8.0.0||resolution_x and resolution_y are now nullable.|