wordpress抓取文章第一张远程图片保存到本地的方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>这个动作我们使用一个hook来实现：</p>
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<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
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代码如下:</div>
<div id="phpcode4" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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add_action('publish_post', 'fetch_images',999);</div>
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再创建一个fetch_images函数，来实现本文所说的所有功能。</p>
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<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
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代码如下:</div>
<div id="phpcode5" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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function fetch_images( $post_ID ){<br>
if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;<br>
if ( !current_user_can('edit_post', $post_ID) ) return;<br>
$post = get_post($post_ID);</div>
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接下来，我们要获取文章内容中的第一张图片：</p>
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<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
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代码如下:</div>
<div id="phpcode6" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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$first_image = '';<br>
preg_match('/<img.+src=[\'\"]([^\'\"]+)[\'\"].* \/>/i',$post->post_content,$images);<br>
if(!empty($images))foreach($images as $image){<br>
if(strpos($image,'http') === 0){<br>
$first_image = $images;<br>
break;<br>
}<br>
}</div>
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但实际上，通过上述的代码获得的图片src可能也是有问题的，或者根本没有抓取到数据。不过我们先不考虑这些问题，我们先实现本文的目标。</p>
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接下来就是关键代码一，它要实现“抓取-保存到本地”两个功能：</p>
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<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
代码如下:</div>
<div id="phpcode7" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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$get = wp_remote_get( $get_image_src );<br>
$type = wp_remote_retrieve_header( $get, 'content-type' );<br>
$file_name = basename($get_image_src);<br>
$file_content = wp_remote_retrieve_body($get);<br>
$mirror = wp_upload_bits($file_name,null,$file_content);</div>
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这个地方有一个变化，上面我们获得了$first_image，这个地方的$get_image_src是上述得到的要抓取的远程图片地址。</p>
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在WordPress中，提供了wp_remote_get、wp_remote_retrieve_body等原创抓取和信息获取函数，你可以查看官方文档以了解和remote相关的函数。wp_upload_bits则将抓取到的图片的二进制内容保存到本地，根据其文件类型，最终成为本地保存的图片，并将保存完后获得的本地图片信息保存在$mirror中。</p>
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既然已经保存到本地了，接下来就是将图片信息保存到数据库中。</p>
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