How to get remote image url and generate thumbnail in php

/**
*
*Function: Adjust image size or generate thumbnail
*Return: True/False
*Parameters:
* $Image The image that needs to be adjusted (including path)
* $Dw=450 Maximum width when adjusting; when thumbnailing The absolute width
* $Dh=450 The maximum height when adjusting; the absolute height when thumbnailing
* $Type=1 1, adjust the size; 2, generate thumbnails
*/ bbs.it-home.org
$phtypes=array('img/gif', 'img/jpg', 'img /jpeg', 'img/bmp', 'img/pjpeg', 'img/x-png');
function compressImg($Image,$Dw,$Dh,$Type) {
 IF(!file_exists($Image)){
 return false;
 }
 // If you need to generate a thumbnail, copy the original image and reassign 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,$h);//Resample copy part of the image and resize it
 ImageJpeg($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;
 }
};

/**
 *Get the image on the server based on url
 *$url 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;
}
?>

Call method:

//Network image path
$imgPath = 'http://news.xxxx.cn/images/1382088444437.jpg';//Remote URL address
$tempPath = 'aa/ bbs.jpg';//Save image path

if(is_file($tempPath)){
 unlink($tempPath);
}

$bigImg=GrabImage($imgPath, $tempPath);
compressImg($bigImg, 70,70,1);
?>