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PHP image compression implementation code

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Release: 2016-07-25 09:00:07
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  1. /*

  2. Function: Adjust image size or generate thumbnail
  3. Return: True/False
  4. Parameters:
  5. $Image The image that needs to be adjusted (including path)
  6. $Dw =450 The maximum width when adjusting; the absolute width when thumbnailing
  7. $Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
  8. $Type=1 1, adjust the size; 2, generate thumbnails
  9. site http:// bbs.it-home.org
  10. */

  11. $path='img/';//path

  12. $phtypes=array(
  13. 'img/gif',
  14. 'img/jpg' ,
  15. 'img/jpeg',
  16. 'img/bmp',
  17. 'img/pjpeg',
  18. 'img/x-png'
  19. );

  20. FunctionImg($Image,$Dw =450,$Dh=450,$Type=1){

  21. IF(!File_Exists($Image)){
  22. ReturnFalse;
  23. }
  24. #If you need to generate a thumbnail, copy the original image and re-assign $Image
  25. IF($Type!=1){
  26. Copy($Image,Str_Replace(".","_x.",$Image));
  27. $Image=Str_Replace(".","_x.",$Image);
  28. }

  29. #Get the file type and create different objects according to different types

  30. $ImgInfo=GetImageSize($Image);
  31. Switch($ImgInfo[2]){
  32. Case1:
  33. $Img =@ImageCreateFromGIF($Image);
  34. Break;
  35. Case2:
  36. $Img =@ImageCreateFromJPEG($Image);
  37. Break;
  38. Case3:
  39. $Img =@ImageCreateFromPNG($Image);
  40. Break;
  41. }< ;/p>
  42. #If the object is not created successfully, it means it is not an image file

  43. IF(Empty($Img)){
  44. #If there is an error when generating thumbnails, you need to delete the copied files
  45. IF($Type!=1){Unlink($Image);}
  46. ReturnFalse;
  47. }

  48. #If the resize operation is performed,

  49. IF($Type==1){
  50. $w=ImagesX($Img);
  51. $h=ImagesY($Img);
  52. $width = $w;
  53. $height = $h;
  54. IF($width>$Dw){
  55. $Par=$Dw /$width;
  56. $width=$Dw;
  57. $height=$height*$Par;
  58. IF($height>$Dh){
  59. $Par=$Dh/$height;
  60. $height=$Dh;
  61. $ width=$width*$Par;
  62. }
  63. }ElseIF($height>$Dh){
  64. $Par=$Dh/$height;
  65. $height=$Dh;
  66. $width=$width*$Par;
  67. IF ($width>$Dw){
  68. $Par=$Dw/$width;
  69. $width=$Dw;
  70. $height=$height*$Par;
  71. }
  72. }Else{
  73. $width=$width;
  74. $ height=$height;
  75. }
  76. $nImg =ImageCreateTrueColor($width,$height); #Create a new true color canvas
  77. ImageCopyReSampled($nImg,$Img,0,0,0,0,$width,$height,$ w,$h); #Resample copy part of the image and resize it
  78. ImageJpeg($nImg,$Image); #Output the image to the browser or file in JPEG format
  79. ReturnTrue;
  80. #If you are performing a thumbnail generation operation, then
  81. }Else{
  82. $w=ImagesX($Img);
  83. $h=ImagesY($Img);
  84. $width = $w;
  85. $height = $h;

  86. $nImg =ImageCreateTrueColor($Dw,$Dh);

  87. IF($h/$w>$Dh/$Dw){#Height is larger
  88. $width=$Dw;
  89. $height=$h*$Dw/$w;
  90. $IntNH=$height-$Dh;
  91. ImageCopyReSampled($nImg, $Img,0,-$IntNH/1.8,0,0, $Dw, $height, $w, $h);
  92. }Else{ #Width Relatively large
  93. $height=$Dh;
  94. $width=$w*$Dh/$h;
  95. $IntNW=$width-$Dw;
  96. ImageCopyReSampled($nImg, $Img,-$IntNW/1.8,0,0 ,0, $width, $Dh, $w, $h);
  97. }
  98. ImageJpeg($nImg,$Image);
  99. ReturnTrue;
  100. }
  101. }
  102. ?>

Copy code

2. Call example

  1. The file types allowed to be uploaded are:
  2. /**
  3. Image compression processing
  4. */
  5. if($_SERVER ['REQUEST_METHOD']=='POST'){
  6. if(!is_uploaded_file($_FILES["photo"][tmp_name])){
  7. echo "The picture does not exist";
  8. exit();
  9. }
  10. if(!is_dir('img')){//Create the path if it does not exist

  11. mkdir('img');
  12. }

  13. $upfile=$_FILES ["photo"];

  14. $pinfo=pathinfo($upfile["name"]);
  15. $name=$pinfo['basename'];//File name
  16. $tmp_name=$upfile["tmp_name"];
  17. $file_type=$pinfo['extension'];//Get the file type
  18. $showphpath=$path.$name;
  19. if(in_array($upfile["type"],$phtypes)){
  20. echo "File type Not consistent! ";
  21. exit();
  22. }
  23. if(move_uploaded_file($tmp_name,$path.$name)){
  24. echo "Success! ";
  25. Img($showphpath,100,800,2);
  26. }
  27. echo "";
  28. }
  29. ?>
  30. < ;/html>

  31. Copy code
  32. Upload pictures


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