A small example of adding watermark to php images

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Release: 2016-07-25 08:57:53
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  1. /**
  2. * Add watermark to image (applicable to png/jpg/gif format)
  3. *
  4. * @author flynetcn
  5. *
  6. * @param $srcImg Original image
  7. * @param $waterImg Watermark image
  8. * @param $savepath Save path
  9. * @param $savename Save name
  10. * @param $positon Watermark position
  11. * 1: Top left, 2: Top right, 3: Center, 4: Bottom left, 5: Bottom right
  12. * @param $alpha Transparency- - 0: Completely transparent, 100: Completely opaque
  13. *
  14. * @return Success -- the new image address after adding watermark
  15. * Failure -- -1: The original file does not exist, -2: The watermarked image does not exist, -3: The original file image object failed to be created
  16. * -4: The watermark file image object failed to be created -5: The new image after watermarking failed to be saved
  17. * @Editor: bbs.it-home.org
  18. */
  19. function img_water_mark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=30)
  20. {
  21. $temp = pathinfo($srcImg);
  22. $name = $temp['basename'];
  23. $path = $temp['dirname'];
  24. $exte = $temp['extension'];
  25. $savename = $savename ? $savename : $name;
  26. $savepath = $savepath ? $savepath : $path;
  27. $savefile = $savepath .'/'. $savename;
  28. $srcinfo = @getimagesize($srcImg);
  29. if ( !$srcinfo) {
  30. return -1; //The original file does not exist
  31. }
  32. $waterinfo = @getimagesize($waterImg);
  33. if (!$waterinfo) {
  34. return -2; //The watermark image does not exist
  35. }
  36. $srcImgObj = image_create_from_ext($srcImg);
  37. if (!$srcImgObj) {
  38. return -3; //Failed to create the original file image object
  39. }
  40. $waterImgObj = image_create_from_ext($waterImg);
  41. if (!$waterImgObj) {
  42. return -4; //Creation of watermark file image object failed
  43. }
  44. switch ($positon) {
  45. //1 top to the left
  46. case 1: $x=$y=0; break;
  47. //2 top to the right
  48. case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;
  49. //3 is centered
  50. case 3: $x = ($srcinfo[0]-$waterinfo[0] )/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break;
  51. //4 bottom is on the left
  52. case 4: $x = 0; $y = $srcinfo[1]-$ waterinfo[1]; break;
  53. //5 bottom is on the right
  54. case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break;
  55. default: $x=$y=0;
  56. }
  57. imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);
  58. switch ($srcinfo[2]) {
  59. case 1: imagegif($srcImgObj, $savefile); break;
  60. case 2: imagejpeg($srcImgObj, $savefile); break;
  61. case 3: imagepng($srcImgObj, $savefile) ; break;
  62. default: return -5; //Save failed
  63. }
  64. imagedestroy($srcImgObj);
  65. imagedestroy($waterImgObj);
  66. return $savefile;
  67. }
  68. function image_create_from_ext($imgfile)
  69. {
  70. $info = getimagesize($imgfile);
  71. $im = null;
  72. switch ($info[2]) {
  73. case 1: $im=imagecreatefromgif($imgfile); break;
  74. case 2: $im=imagecreatefromjpeg($imgfile) ; break;
  75. case 3: $im=imagecreatefrompng($imgfile); break;
  76. }
  77. return $im;
  78. }
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