PHP download remote images and save to local code

When we use PHP as a simple crawler, we often encounter the need to download remote images, so the following is a simple implementation of the requirements. The main article and we introduce the PHP implementation of remote image download method, small series feel very good, and now share to everyone, but also for everyone to do a reference, hope to help everyone.

1. Using Curl

For example, we have the following two pictures:

$images = [  ' https://dn-laravist.qbox.me/2015-09-22_00-17-06j.png ',  ' https://dn-laravist.qbox.me/ 2015-09-23_00-58-03j.png '];

In the first step, we can directly use the simplest code implementations:

function Download ($url, $path = ' images/') {  $ch = Curl_init ();  curl_setopt ($ch, Curlopt_url, $url);  curl_setopt ($ch, Curlopt_returntransfer, 1);  curl_setopt ($ch, Curlopt_connecttimeout,);  $file = curl_exec ($ch);  Curl_close ($ch);  $filename = PathInfo ($url, pathinfo_basename);  $resource = fopen ($path. $filename, ' a ');  Fwrite ($resource, $file);  Fclose ($resource);}

That's what you can do when you download a remote image:

foreach ($images as $url) {  download ($url);}

2. Encapsulation of a class

After the idea is clear, we can encapsulate this basic function in a class:

Class Spider {public  function downloadimage ($url, $path = ' images/')  {    $ch = Curl_init ();    curl_setopt ($ch, Curlopt_url, $url);    curl_setopt ($ch, Curlopt_returntransfer, 1);    curl_setopt ($ch, Curlopt_connecttimeout,);    $file = curl_exec ($ch);    Curl_close ($ch);    $filename = PathInfo ($url, pathinfo_basename);    $resource = fopen ($path. $filename, ' a ');    Fwrite ($resource, $file);    Fclose ($resource);  }}

We can also optimize this a little bit:

Public Function Downloadimage ($url, $path = ' images/')  {    $ch = Curl_init ();    curl_setopt ($ch, Curlopt_url, $url);    curl_setopt ($ch, Curlopt_returntransfer, 1);    curl_setopt ($ch, Curlopt_connecttimeout,);    $file = curl_exec ($ch);    Curl_close ($ch);    $this->saveasimage ($url, $file, $path);  }  Private Function Saveasimage ($url, $file, $path)  {    $filename = PathInfo ($url, pathinfo_basename);    $resource = fopen ($path. $filename, ' a ');    Fwrite ($resource, $file);    Fclose ($resource);  }

After encapsulation into a class, we can call the code to download the image:

$spider = new Spider (), foreach ($images as $url) {  $spider->downloadimage ($url);}

This way, the basic remote image download is OK.