PHP Image Add Watermark function Simple example

Source: Internet
Author: User
  1. /**

  2. * Image plus watermark (for png/jpg/gif format)
  3. *
  4. * @author FLYNETCN
  5. *
  6. * @param $srcImg Original picture
  7. * @param $waterImg watermark Picture
  8. * @param $savepath Save path
  9. * @param $savename Save name
  10. * @param $positon Watermark Location
  11. * 1: Top left, 2: Top right, 3: center, 4: Bottom station left, 5: Bottom of Right
  12. * @param $alpha PHP watermark Transparency--0: Fully transparent, 100: completely opaque
  13. *
  14. * @return Success--The new image address after adding watermark
  15. * Failure---1: The original file does not exist,-2: Watermark picture does not exist,-3: Original file image object failed to build
  16. *-4: Watermark file Image Object build failed-5: New picture saved after Watermark failed
  17. * * Reference: PHP text watermark, PHP watermark class
  18. function Img_water_mark ($SRCIMG, $WATERIMG, $savepath =null, $savename =null, $positon =5, $alpha =30)
  19. {
  20. $temp = PathInfo ($SRCIMG);
  21. $name = $temp [' basename '];
  22. $path = $temp [' dirname '];
  23. $exte = $temp [' extension '];
  24. $savename = $savename? $savename: $name;
  25. $savepath = $savepath? $savepath: $path;
  26. $savefile = $savepath. ' /'. $savename;
  27. $srcinfo = @getimagesize ($SRCIMG);
  28. if (! $srcinfo) {
  29. return-1; The original file does not exist
  30. }
  31. $waterinfo = @getimagesize ($WATERIMG);
  32. if (! $waterinfo) {
  33. Return-2; Watermark picture does not exist
  34. }
  35. $SRCIMGOBJ = Image_create_from_ext ($SRCIMG);
  36. if (! $srcImgObj) {
  37. return-3; The original file image object failed to build
  38. }
  39. $WATERIMGOBJ = Image_create_from_ext ($WATERIMG);
  40. if (! $waterImgObj) {
  41. return-4; Failed to build Watermark file image Object
  42. }
  43. Switch ($positon) {
  44. 1 Top Left
  45. Case 1: $x = $y = 0; Break
  46. 2 top Right
  47. Case 2: $x = $srcinfo [0]-$waterinfo [0]; $y = 0; Break
  48. 3 centering
  49. Case 3: $x = ($srcinfo [0]-$waterinfo [0])/2; $y = ($srcinfo [1]-$waterinfo [1])/2; Break
  50. 4 bottom Left
  51. Case 4: $x = 0; $y = $srcinfo [1]-$waterinfo [1]; Break
  52. 5 bottom Right
  53. Case 5: $x = $srcinfo [0]-$waterinfo [0]; $y = $srcinfo [1]-$waterinfo [1]; Break
  54. Default: $x = $y = 0;
  55. }
  56. Imagecopymerge ($SRCIMGOBJ, $WATERIMGOBJ, $x, $y, 0, 0, $waterinfo [0], $waterinfo [1], $alpha);
  57. Switch ($srcinfo [2]) {
  58. Case 1:imagegif ($SRCIMGOBJ, $savefile); Break
  59. Case 2:imagejpeg ($SRCIMGOBJ, $savefile); Break
  60. Case 3:imagepng ($SRCIMGOBJ, $savefile); Break
  61. default:return-5; Save failed
  62. }
  63. Imagedestroy ($SRCIMGOBJ);
  64. Imagedestroy ($WATERIMGOBJ);
  65. return $savefile;
  66. }

  67. function Image_create_from_ext ($imgfile)

  68. {
  69. $info = getimagesize ($imgfile);
  70. $im = null;
  71. Switch ($info [2]) {
  72. Case 1: $im =imagecreatefromgif ($imgfile); Break
  73. Case 2: $im =imagecreatefromjpeg ($imgfile); Break
  74. Case 3: $im =imagecreatefrompng ($imgfile); Break
  75. }
  76. return $im;
  77. }

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