PHP method analysis of obtaining remote images and downloading and saving them locally-PHP Tutorial-php.cn

PHP method analysis of obtaining remote images and downloading and saving them locally

高洛峰

Release： 2023-03-03 17:58:01

Original

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The example in this article describes the method of obtaining remote images in php and downloading and saving them locally. I share it with you for your reference. The details are as follows:

Remote pictures refer to the data on the remote server. We can read and download them through many functions of PHP. Here are two remote pictures that can be automatically downloaded and saved to Local example.

Example 1, the image type can be automatically identified and then saved accordingly

/*
*功能：php完美实现下载远程图片保存到本地
*参数：文件url,保存文件目录,保存文件名称，使用的下载方式
*当保存文件名称为空时则使用远程文件原来的名称
*/
function getImage($url,$save_dir=&#39;&#39;,$filename=&#39;&#39;,$type=0){
  if(trim($url)==&#39;&#39;){
 return array(&#39;file_name&#39;=>&#39;&#39;,&#39;save_path&#39;=>&#39;&#39;,&#39;error&#39;=>1);
 }
 if(trim($save_dir)==&#39;&#39;){
 $save_dir=&#39;./&#39;;
 }
  if(trim($filename)==&#39;&#39;){//保存文件名
    $ext=strrchr($url,&#39;.&#39;);
    if($ext!=&#39;.gif&#39;&&$ext!=&#39;.jpg&#39;){
  return array(&#39;file_name&#39;=>&#39;&#39;,&#39;save_path&#39;=>&#39;&#39;,&#39;error&#39;=>3);
 }
    $filename=time().$ext;
  }
 if(0!==strrpos($save_dir,&#39;/&#39;)){
 $save_dir.=&#39;/&#39;;
 }
 //创建保存目录
 if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){
 return array(&#39;file_name&#39;=>&#39;&#39;,&#39;save_path&#39;=>&#39;&#39;,&#39;error&#39;=>5);
 }
  //获取远程文件所采用的方法
  if($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.$filename,&#39;a&#39;);
  fwrite($fp2,$img);
  fclose($fp2);
 unset($img,$url);
  return array(&#39;file_name&#39;=>$filename,&#39;save_path&#39;=>$save_dir.$filename,&#39;error&#39;=>0);
}

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Example 2, 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
}
$img = GrabImage("http://www.jb51.net /6648d73db0edd1e89f3d62f7.jpg", "");
if ($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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In fact, the editor’s favorite download method above is not these two but curl saving asynchronously It would be better to download the image.

I hope this article will be helpful to everyone in PHP programming.

For more PHP methods to obtain remote images and download and save them locally, please pay attention to the PHP Chinese website!