php getimagesize获取图片信息(.jpg,.gif,.png)

/*

.jpg   .jpeg

array (size=7)
  0 => int 120
  1 => int 90
  2 => int 2
  3 => string "width="120" height="90"" (length=23)
  "bits" => int 8
  "channels" => int 3
  "mime" => string "image/jpeg" (length=10)

*/

/*

.gif
array (size=7)
  0 => int 20
  1 => int 20
  2 => int 1
  3 => string "width="20" height="20"" (length=22)
  "bits" => int 8
  "channels" => int 3
  "mime" => string "image/gif" (length=9)
*/

/*

.png
array (size=6)
  0 => int 450
  1 => int 450
  2 => int 3
  3 => string "width="450" height="450"" (length=24)
  "bits" => int 8
  "mime" => string "image/png" (length=9)
*/