Detailed explanation of the example code of how to save remote images to a local folder in PHP

Remote pictures refer to data on the remote server that we can read and download through many functions of PHP. Here are two examples that can automatically download remote pictures and download and save them locally.

Function: PHP perfectly implements downloading remote pictures and saving them locally. When the saved file name is empty, remote fileoriginal name

Parameters: file url, save file directory, save file name, download method used

Can automatically identify the image type and save it accordingly

function getImage($url,$save_dir='',$filename='',$type=0){
  if(trim($url)==''){
 return array('file_name'=>'','save_path'=>'','error'=>1);
 }
 if(trim($save_dir)==''){
 $save_dir='./';
 }
  if(trim($filename)==''){//保存文件名
    $ext=strrchr($url,'.');
    if($ext!='.gif'&&$ext!='.jpg'){
  return array('file_name'=>'','save_path'=>'','error'=>3);
 }
    $filename=time().$ext;
  }
 if(0!==strrpos($save_dir,'/')){
 $save_dir.='/';
 }
 //创建保存目录
 if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){
 return array('file_name'=>'','save_path'=>'','error'=>5);
 }
  //获取远程文件所采用的方法
  if($type){
 $ch=curl_init();
 $timeout=5;
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
 curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
 $img=curl_exec($ch);
 curl_close($ch);
  }else{
   ob_start();
   readfile($url);
   $img=ob_get_contents();
   ob_end_clean();
  }
  //$size=strlen($img);
  //文件大小
  $fp2=@fopen($save_dir.$filename,'a');
  fwrite($fp2,$img);
  fclose($fp2);
 unset($img,$url);
  return array('file_name'=>$filename,'save_path'=>$save_dir.$filename,'error'=>0);
}

If it is not a picture, it will be automatically skipped

<?php
function GrabImage($url, $filename = "") {
 if ($url == ""):return false;
 endif;
 //如果$url地址为空，直接退出
 if ($filename == "") {
 //如果没有指定新的文件名
 $ext = strrchr($url, ".");
 //得到$url的图片格式
 if ($ext != ".gif" && $ext != ".jpg"):return false;
 endif;
 //如果图片格式不为.gif或者.jpg，直接退出
 $filename = date("dMYHis") . $ext;
 //用天月面时分秒来命名新的文件名
 }
 ob_start();//打开输出
 readfile($url);//输出图片文件
 $img = ob_get_contents();//得到浏览器输出
 ob_end_clean();//清除输出并关闭
 $size = strlen($img);//得到图片大小
 $fp2 = @fopen($filename, "a");
 fwrite($fp2, $img);//向当前目录写入图片文件，并重新命名
 fclose($fp2);
 return $filename;//返回新的文件名
}
$img = GrabImage("http://www.php.cn/6648d73db0edd1e89f3d62f7.jpg", "");
if ($img):echo &#39;<pre class="brush:php;toolbar:false"><img src="&#39; . $img . &#39;">

'; //如果返回值为真，这显示已经采集到服务器上的图片 else:echo "false"; endif; //否则，输出采集失败 ?>

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