Image output garbled

Problem: garbled image output & lt ;? Php?image='new0.jpg '; $ img = getimagesize ($ image); // print_r ($ img); switch ($ img [2]) {case1: $ dimg = imagecreatef help: garbled image output
Required imageapps'new0.jpg ';
$ Img = getimagesize ($ image );
// Print_r ($ img );
Switch ($ img [2]) {
Case 1:
$ Dimg = imagecreatefromgif ($ image );
Case 2:
$ Dimg = imagecreatefromjpeg ($ image );
Case 3:
$ Dimg = imagecreatefrompng ($ image );
}
Header ("Content-type: image/jpeg ");
Imagejpeg ($ dimg );
?>
The above is the source code. if this is used directly, a prompt will be prompted.
Warning: Imagecreatefrompng () [function. imagecreatefrompng]: 'new0.jpg 'is not a valid PNG file in E: \ wamp \ www \ test \ imgtest. phpOn line 11
Warning: Imagejpeg () expects parameter 1 to be resource, boolean given in E: \ wamp \ www \ test \ imgtest
Tested Image type: Array
(
[0] = & gt; 479
[1] => 700.
[2] => 2
[3] => width = "479" height = "700"
[Bits] => 8
[Channels] => 3
[Mime] => image/jpeg
)
The problem is that the switch statement does not seem to have been successfully run. Why does it mean to judge imagecreatefrompng?
If you do not want to switch the statement and run imagecreatefromjpeg directly, the output is garbled. why?

------ Solution --------------------
Switch ($ img [2]) {
Case 1:
$ Dimg = imagecreatefromgif ($ image );
Break;
Case 2:
$ Dimg = imagecreatefromjpeg ($ image );
Break;
Case 3:
$ Dimg = imagecreatefrompng ($ image );
Break;
}