PHP远程下载图片保存到本地的方法[demo]

你的名字 2022-05-21 11:18 265阅读 0赞

本篇文章主要介绍了PHP远程下载图片保存到本地的方法，现在分享给大家，给大家做个参考。

在使用 PHP 做简单的爬虫的时候，我们经常会遇到需要下载远程图片的需求，所以下面来简单实现这个需求。

1.使用 curl

比如我们有下面这两张图片：

第一步，我们可以直接来使用最简单的代码实现：

<table style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-spacing:0px;color:rgb(51,51,51);border-collapse:separate;border:1px solid rgb(204,204,204);font-size:13px;background:rgb(245,245,245) none;"> 
 <tbody style="font-family:'微软雅黑';"> 
  <tr> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;vertical-align:baseline;font-size:13px;color:rgb(175,175,175);background:rgb(247,247,249) none;"> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">1</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">2</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">3</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">4</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">5</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">6</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">7</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">8</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">9</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">10</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">11</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">12</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">13</span> 
    </div></td> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-width:0px;vertical-align:baseline;font-size:13px;background:none;"> 
    <div style="font-family:'微软雅黑';border:0px;vertical-align:baseline;background:none;"> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">function&nbsp;download($url,&nbsp;$path&nbsp;=&nbsp;'images/')</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">{ </span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$ch&nbsp;= curl_init();</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_URL,&nbsp;$url);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$file&nbsp;= curl_exec($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_close($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$filename&nbsp;=&nbsp;pathinfo($url, PATHINFO_BASENAME);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$resource&nbsp;=&nbsp;fopen($path&nbsp;.&nbsp;$filename,&nbsp;'a');</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fwrite($resource,&nbsp;$file);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fclose($resource);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">}</span> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

那在下载远程图片的时候就可以这样：

2.封装一个类

缕清思路之后，我们可以将这个基本的功能封装到一个类中：

<table style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-spacing:0px;color:rgb(51,51,51);border-collapse:separate;border:1px solid rgb(204,204,204);font-size:13px;background:rgb(245,245,245) none;"> 
 <tbody style="font-family:'微软雅黑';"> 
  <tr> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;vertical-align:baseline;font-size:13px;color:rgb(175,175,175);background:rgb(247,247,249) none;"> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">1</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">2</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">3</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">4</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">5</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">6</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">7</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">8</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">9</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">10</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">11</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">12</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">13</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">14</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">15</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">16</span> 
    </div></td> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-width:0px;vertical-align:baseline;font-size:13px;background:none;"> 
    <div style="font-family:'微软雅黑';border:0px;vertical-align:baseline;background:none;"> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">class&nbsp;Spider { </span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"></div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">public&nbsp;function&nbsp;downloadImage($url,&nbsp;$path&nbsp;=&nbsp;'images/')</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">{ </span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$ch&nbsp;= curl_init();</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_URL,&nbsp;$url);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$file&nbsp;= curl_exec($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_close($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$filename&nbsp;=&nbsp;pathinfo($url, PATHINFO_BASENAME);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$resource&nbsp;=&nbsp;fopen($path&nbsp;.&nbsp;$filename,&nbsp;'a');</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fwrite($resource,&nbsp;$file);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fclose($resource);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">}</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">}</span> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

在者，我们还可以这样稍微优化一下：

<table style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-spacing:0px;color:rgb(51,51,51);border-collapse:separate;border:1px solid rgb(204,204,204);font-size:13px;background:rgb(245,245,245) none;"> 
 <tbody style="font-family:'微软雅黑';"> 
  <tr> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;vertical-align:baseline;font-size:13px;color:rgb(175,175,175);background:rgb(247,247,249) none;"> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">1</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">2</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">3</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">4</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">5</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">6</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">7</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">8</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">9</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">10</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">11</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">12</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">13</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">14</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">15</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">16</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">17</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">18</span> 
    </div> 
    <div style="font-family:'微软雅黑';border:0px;text-align:right;vertical-align:baseline;background:none;"> 
     <span style="line-height:2.5;">19</span> 
    </div></td> 
   <td style="font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;border-width:0px;vertical-align:baseline;font-size:13px;background:none;"> 
    <div style="font-family:'微软雅黑';border:0px;vertical-align:baseline;background:none;"> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">public&nbsp;function&nbsp;downloadImage($url,&nbsp;$path='images/')</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">{ </span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$ch&nbsp;= curl_init();</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_URL,&nbsp;$url);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$file&nbsp;= curl_exec($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">curl_close($ch);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"></div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$this-&gt;saveAsImage($url,&nbsp;$file,&nbsp;$path);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">}</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"></div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">private&nbsp;function&nbsp;saveAsImage($url,&nbsp;$file,&nbsp;$path)</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">{ </span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$filename&nbsp;=&nbsp;pathinfo($url, PATHINFO_BASENAME);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">$resource&nbsp;=&nbsp;fopen($path&nbsp;.&nbsp;$filename,&nbsp;'a');</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fwrite($resource,&nbsp;$file);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">fclose($resource);</span> 
     </div> 
     <div style="border:0px;vertical-align:baseline;background:none;"> 
      <span style="line-height:2.5;">}</span> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

封装成类之后，我们可以这样调用代码来下载图片：

这样，对付基本的远程图片下载就OK了。