Detailed explanation of how to download remote images and save them locally using PHP-PHP Tutorial-php.cn

Detailed explanation of how to download remote images and save them locally using PHP

墨辰丷

Release： 2023-03-27 09:08:02

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This article mainly introduces the method of downloading remote images in PHP. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

When using PHP to make a simple crawler, we often encounter the need to download remote images, so let’s simply implement this need.

1. Use curl

For example, we have the following two pictures:

$images = [
  &#39;https://dn-laravist.qbox.me/2015-09-22_00-17-06j.png&#39;,
  &#39;https://dn-laravist.qbox.me/2015-09-23_00-58-03j.png&#39;
];

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

function download($url, $path = &#39;images/&#39;)
{
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
  $file = curl_exec($ch);
  curl_close($ch);
  $filename = pathinfo($url, PATHINFO_BASENAME);
  $resource = fopen($path . $filename, &#39;a&#39;);
  fwrite($resource, $file);
  fclose($resource);
}

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Then when downloading remote images, you can do this:

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

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2. Encapsulate a class

After clarifying the idea, we can encapsulate this basic function Into a class:

class Spider {

  public function downloadImage($url, $path = &#39;images/&#39;)
  {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    $file = curl_exec($ch);
    curl_close($ch);
    $filename = pathinfo($url, PATHINFO_BASENAME);
    $resource = fopen($path . $filename, &#39;a&#39;);
    fwrite($resource, $file);
    fclose($resource);
  }
}

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Now, we can also optimize it a little like this:

public function downloadImage($url, $path=&#39;images/&#39;)
  {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    $file = curl_exec($ch);
    curl_close($ch);

    $this->saveAsImage($url, $file, $path);
  }

  private function saveAsImage($url, $file, $path)
  {
    $filename = pathinfo($url, PATHINFO_BASENAME);
    $resource = fopen($path . $filename, &#39;a&#39;);
    fwrite($resource, $file);
    fclose($resource);
  }

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After encapsulating it into a class, we can call the code to download the image like this:

$spider = new Spider();

foreach ( $images as $url ) {
  $spider->downloadImage($url);
}

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In this way, basic remote image downloading is OK.

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