imagejpeg() creates a JPEG file from the given image.
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
The path to save the file to. If not set or
NULL, the raw image stream
will be outputted directly.
To skip this argument in order to provide the
quality parameter, use
quality is optional, and ranges from 0 (worst quality, smaller file) to 100 (best quality, biggest file). The default is the default IJG quality value (about 75).
JPEG support is only available if PHP was compiled against GD-1.8 or later.
If you want to output Progressive JPEGs, you need to set interlacing on with imageinterlace().