PHP implementation code to obtain remote images and adjust image size

 /**
 *
 *Function: adjust image size or generate thumbnail
 *Modified: 2013-2-15
 *Return: True/False
 *Parameters:
 * $Image The image that needs to be adjusted (including path)
 * $Dw= 450 The maximum width when adjusting; the absolute width when thumbnailing
 * $Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
 * $Type=1 1, adjust the size; 2, generate thumbnails
 * site http: //bbs.it-home.org
*/
 $phtypes=array('img/gif', 'img/jpg', 'img/jpeg', 'img/bmp', 'img /pjpeg', 'img/x-png');

 function compressImg($Image,$Dw,$Dh,$Type){
 echo $Image;
 IF(!file_exists($Image)){
 echo " No image exists";
 return false;
 }
 echo "Image exists";
 // If you need to generate a thumbnail, copy the original image and re-assign it to $Image (generate thumbnail operation)
 // When Type= =1, the original image file will not be copied, but the reduced image will be regenerated on the original image file (resize operation)
 IF($Type!=1){
 copy($Image,str_replace(" .","_x.",$Image));
 $Image=str_replace(".","_x.",$Image);
 }
 // Get the file type and create different objects according to different types
 $ImgInfo=getimagesize($Image);
 Switch($ImgInfo[2]){
 case 1:
 $Img =@imagecreatefromgif($Image);
 break;
 case 2:
 $Img =@imagecreatefromjpeg($ Image);
 Break;
 case 3:
 $Img =@imagecreatefrompng($Image);
 break;
 }
 // If the object is not created successfully, it means it is a non-image file
 IF(Empty($Img)){
 // If there is an error when generating thumbnails, you need to delete the copied files
 IF($Type!=1){
 unlink($Image);
 }
 return false;
 }
 // If yes To perform the resize operation,
 IF($Type==1){
 $w=ImagesX($Img);
 $h=ImagesY($Img);
 $width = $w;
 $height = $h;
 IF($width>$Dw){
 $Par=$Dw/$width;
 $width=$Dw;
 $height=$height*$Par;
 IF($height>$Dh){
 $Par= $Dh/$height;
 $height=$Dh;
 $width=$width*$Par;
 }
 } ElseIF($height>$Dh) {
 $Par=$Dh/$height;
 $height= $Dh;
 $width=$width*$Par;
 IF($width>$Dw){
 $Par=$Dw/$width;
 $width=$Dw;
 $height=$height*$Par;
 }
 } Else {
 $width=$width;
 $height=$height;
 }
 $nImg =ImageCreateTrueColor($width,$height);// Create a new true color canvas
 ImageCopyReSampled($nImg,$Img ,0,0,0,0,$width,$height,$w,$h);//Resample and copy part of the image and resize it
 ImageJpeg($nImg,$Image);//Output the image in JPEG format To the browser or file
 return true;
 } Else {// If the thumbnail generation operation is performed,
 $w=ImagesX($Img);
 $h=ImagesY($Img);
 $width = $w;
 $height = $h;
 $nImg =ImageCreateTrueColor($Dw,$Dh);
 IF($h/$w>$Dh/$Dw){// Height is larger
 $width=$Dw;
 $ height=$h*$Dw/$w;
 $IntNH=$height-$Dh;
 ImageCopyReSampled($nImg, $Img, 0, -$IntNH/1.8, 0, 0, $Dw, $height, $w , $h);
 } Else {// Larger width ratio
 $height=$Dh;
 $width=$w*$Dh/$h;
 $IntNW=$width-$Dw;
 ImageCopyReSampled($nImg, $Img,-$IntNW/1.8,0,0,0, $width, $Dh, $w, $h);
 }
 ImageJpeg($nImg,$Image);
 return true;
 }
 };
 ?>

2. Get remote pictures

 //Network image path
 $imgPath = 'http://bbs.it-home.org/phone/compress-img/251139474ba926db3d7850.jpg';
 //$imgPath = "http://bbs.it-home.org/userfiles/image/20111125/251139474ba926db3d7850.jpg";
 $tempPath = str_replace('http://bbs.it-home.org/', '', $imgPath );//Replace newline characters
 $name = strrchr($tempPath, "/");
 $path = str_replace($name, '', $tempPath);//Replace newline characters

 /**
 *Create multi-level directories based on the path path
 *$dir target directory $mode permissions, 0700 represents the highest permissions
 */
 function makedir( $dir , $mode = "0700" ) {
 if(strpos($dir , "/" )){
 $dir_path = "" ;
 $dir_info = explode("/" , $dir );
 foreach($dir_info as $key => $value){
 $dir_path .= $value ;
 if (!file_exists($dir_path)){
 @mkdir($dir_path, $mode) or die (" Failed to create folder" );
 @chmod($dir_path, $mode);
 } else {
 $dir_path .= "/" ;
 continue ;
 }
 $dir_path .= "/" ;
 }
 return $dir_path ;
 } else {
 @mkdir($dir, $mode) or die( "Creation failed, please check permissions" );
 @chmod($dir, $mode);
 return $dir ;
 }
 } //end makedir
 makedir($path);

 /**
 *Get the image on the server based on the url
 *$url The image path on the server $filename file name
*/
 function GrabImage($url,$filename="") {
 if($url=="") return false;
 if($filename=="") {
 $ext=strrchr($url,".");
 if($ext!=".gif" && $ext!=".jpg" && $ext!= ".png")
 return false;
 $filename=date("YmdHis").$ext;
 }
 ob_start();
 readfile($url);
 $img = ob_get_contents();
 ob_end_clean();
 $size = strlen($img);

 $fp2=@fopen($filename, "a");
 fwrite($fp2,$img);
 fclose($fp2);
 return $filename;
 }
 ?>

3. Call example

 The file types allowed to be uploaded are:

  echo $path ."";
 /**/
 $bigImg=GrabImage($imgPath, $tempPath);
 if($bigImg){
 echo '


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