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HomeBackend DevelopmentPHP TutorialPHP implementation code to obtain remote images and adjust image size

  1. /**
  2. *
  3. *Function: adjust image size or generate thumbnail
  4. *Modified: 2013-2-15
  5. *Return: True/False
  6. *Parameters:
  7. * $Image The image that needs to be adjusted (including path)
  8. * $Dw= 450 The maximum width when adjusting; the absolute width when thumbnailing
  9. * $Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
  10. * $Type=1 1, adjust the size; 2, generate thumbnails
  11. * site http: //bbs.it-home.org
  12. */
  13. $phtypes=array('img/gif', 'img/jpg', 'img/jpeg', 'img/bmp', 'img /pjpeg', 'img/x-png');
  14. function compressImg($Image,$Dw,$Dh,$Type){
  15. echo $Image;
  16. IF(!file_exists($Image)){
  17. echo " No image exists";
  18. return false;
  19. }
  20. echo "Image exists";
  21. // If you need to generate a thumbnail, copy the original image and re-assign it to $Image (generate thumbnail operation)
  22. // When Type= =1, the original image file will not be copied, but the reduced image will be regenerated on the original image file (resize operation)
  23. IF($Type!=1){
  24. copy($Image,str_replace(" .","_x.",$Image));
  25. $Image=str_replace(".","_x.",$Image);
  26. }
  27. // Get the file type and create different objects according to different types
  28. $ImgInfo=getimagesize($Image);
  29. Switch($ImgInfo[2]){
  30. case 1:
  31. $Img =@imagecreatefromgif($Image);
  32. break;
  33. case 2:
  34. $Img =@imagecreatefromjpeg($ Image);
  35. Break;
  36. case 3:
  37. $Img =@imagecreatefrompng($Image);
  38. break;
  39. }
  40. // If the object is not created successfully, it means it is a non-image file
  41. IF(Empty($Img)){
  42. // If there is an error when generating thumbnails, you need to delete the copied files
  43. IF($Type!=1){
  44. unlink($Image);
  45. }
  46. return false;
  47. }
  48. // If yes To perform the resize operation,
  49. IF($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,$h);//Resample and copy part of the image and resize it
  78. ImageJpeg($nImg,$Image);//Output the image in JPEG format To the browser or file
  79. return true;
  80. } Else {// If the thumbnail generation operation is performed,
  81. $w=ImagesX($Img);
  82. $h=ImagesY($Img);
  83. $width = $w;
  84. $height = $h;
  85. $nImg =ImageCreateTrueColor($Dw,$Dh);
  86. IF($h/$w>$Dh/$Dw){// Height is larger
  87. $width=$Dw;
  88. $ height=$h*$Dw/$w;
  89. $IntNH=$height-$Dh;
  90. ImageCopyReSampled($nImg, $Img, 0, -$IntNH/1.8, 0, 0, $Dw, $height, $w , $h);
  91. } Else {// Larger width ratio
  92. $height=$Dh;
  93. $width=$w*$Dh/$h;
  94. $IntNW=$width-$Dw;
  95. ImageCopyReSampled($nImg, $Img,-$IntNW/1.8,0,0,0, $width, $Dh, $w, $h);
  96. }
  97. ImageJpeg($nImg,$Image);
  98. return true;
  99. }
  100. };
  101. ?>
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2. Get remote pictures

  1. //Network image path
  2. $imgPath = 'http://bbs.it-home.org/phone/compress-img/251139474ba926db3d7850.jpg';
  3. //$imgPath = "http://bbs.it-home.org/userfiles/image/20111125/251139474ba926db3d7850.jpg";
  4. $tempPath = str_replace('http://bbs.it-home.org/', '', $imgPath );//Replace newline characters
  5. $name = strrchr($tempPath, "/");
  6. $path = str_replace($name, '', $tempPath);//Replace newline characters
  7. /**
  8. *Create multi-level directories based on the path path
  9. *$dir target directory $mode permissions, 0700 represents the highest permissions
  10. */
  11. function makedir( $dir , $mode = "0700" ) {
  12. if(strpos($dir , "/" )){
  13. $dir_path = "" ;
  14. $dir_info = explode("/" , $dir );
  15. foreach($dir_info as $key => $value){
  16. $dir_path .= $value ;
  17. if (!file_exists($dir_path)){
  18. @mkdir($dir_path, $mode) or die (" Failed to create folder" );
  19. @chmod($dir_path, $mode);
  20. } else {
  21. $dir_path .= "/" ;
  22. continue ;
  23. }
  24. $dir_path .= "/" ;
  25. }
  26. return $dir_path ;
  27. } else {
  28. @mkdir($dir, $mode) or die( "Creation failed, please check permissions" );
  29. @chmod($dir, $mode);
  30. return $dir ;
  31. }
  32. } //end makedir
  33. makedir($path);
  34. /**
  35. *Get the image on the server based on the url
  36. *$url The image path on the server $filename file name
  37. */
  38. function GrabImage($url,$filename="") {
  39. if($url=="") return false;
  40. if($filename=="") {
  41. $ext=strrchr($url,".");
  42. if($ext!=".gif" && $ext!=".jpg" && $ext!= ".png")
  43. return false;
  44. $filename=date("YmdHis").$ext;
  45. }
  46. ob_start();
  47. readfile($url);
  48. $img = ob_get_contents();
  49. ob_end_clean();
  50. $size = strlen($img);
  51. $fp2=@fopen($filename, "a");
  52. fwrite($fp2,$img);
  53. fclose($fp2);
  54. return $filename;
  55. }
  56. ?>
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3. Call example

  1. The file types allowed to be uploaded are:=implode(', ',$phtypes)?>
  2. echo $path ."
    ";
  3. /**/
  4. $bigImg=GrabImage($imgPath, $tempPath);
  5. if($bigImg){
  6. echo 'PHP implementation code to obtain remote images and adjust image size
  7. Copy code
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