Thinkphp watermark function, fixed the PNG transparent watermark, added JPEG image quality adjustable

TP comes with an image class and can be used to add watermarks to an image.
Here we have improved:
1. PNG watermark transparency
2. Adjust the watermark quality (only in JPG format)
The Code is as follows:
Red indicates the original system
Green indicates the modified
/**
+ --------------------
* Add a watermark to an image
+ --------------------
* @ Static public
+ --------------------
* @ Param string $ source original file name
* @ Param string $ water watermark image
* @ Param string $ savename watermark image name
* @ Param string $ transparency of the Alpha watermark
+ --------------------
* @ Return string
+ --------------------
* @ Throws thinkexecption
+ --------------------
*/
Static public function water ($ source, $ water, $ savename = NULL, $ alpha = 80 ){
// Check whether the file exists
If (! File_exists ($ source) |! File_exists ($ water ))
Return false;

// Image Information
$ SINFO = self: getimageinfo ($ source );
$ Winfo = self: getimageinfo ($ water );

// If the image is smaller than the watermark image, no image is generated.
If ($ SINFO ["width"] <$ winfo ["width"] | $ SINFO ['height'] <$ winfo ['height'])
Return false;

// Create an image
$ Screatefun = "imagecreatefrom". $ SINFO ['type'];
$ Simage = $ screatefun ($ source );
$ Wcreatefun = "imagecreatefrom". $ winfo ['type'];
$ Wimage = $ wcreatefun ($ water );

// Set the mixed color mode of the image
Imagealphablending ($ wimage, true );

// Image position, right-aligned by default
$ Posy = $ SINFO ["height"]-$ winfo ["height"];
$ Posx = $ SINFO ["width"]-$ winfo ["width"];

/* Use imagecopy */
Imagecopy ($ simage,
$ Wimage, $ posx, $ Posy, 0, 0, $ winfo ['width'], $ winfo ['height']);
// Generate a hybrid image. This is the system's
//
Imagecopymerge ($ simage, $ wimage, $ posx, $ Posy, 0, 0, $ winfo ['width'], $ winfo ['height'], $ alpha );
// Output image
$ Imagefun = 'image'. $ SINFO ['type'];
// If no save file name is provided, the original image name is used by default.
If (! $ Savename ){
$ Savename = $ source;
@ Unlink ($ source );
}
// Save the image. If it is JPG, set the watermark quality.
If
($ SINFO ['type'] = "jpg" | $ SINFO ['type'] = "Jpeg "){
Imagejpeg ($ simage,
$ Savename, 90); // 3rd parameters, even if the quality is large, because only imagejpeg supports this parameter
}
Else {
$ Imagefun ($ simage,
$ Savename );
}
// $ Imagefun ($ simage,
$ Savename );
Imagedestroy ($ simage );
}

Finally, we would like to thank konakona for providing it.