在PHP中抓取网页的照片

Question

如果用样式写入的网址，如何从网站复制照片的网址。

<div class="thumb"> 
       <a href="http://goruzont.blogspot.com/2017/04/blog-post_6440.html" style="background:url(https://1.bp.blogspot.com/-6vpIH5iqPYs/WPzlNdxsRpI/AAAAAAAAntU/d7U_Ch_6FiIPwosNL4tWwqBeXw8qwo2nACLcB/s1600/1424051.jpg) no-repeat center center;background-size:cover"> 

<span class="thumb-overlay"></span></a> 
</div> 

Answer 1

您可以使用正则表达式只提取背景图像或背景：URL格式

$str=' 
<div class="thumb"> 
       <a href="http://goruzont.blogspot.com/2017/04/blog-post_6440.html" style="background:url(https://1.bp.blogspot.com/-6vpIH5iqPYs/WPzlNdxsRpI/AAAAAAAAntU/d7U_Ch_6FiIPwosNL4tWwqBeXw8qwo2nACLcB/s1600/1424051.jpg) no-repeat center center;background-size:cover"> 

<span class="thumb-overlay"></span></a> 
</div>'; 

preg_match_all('~\bbackground(-image)?\s*:(.*?)\(\s*(\'|")?(?<image>.*?)\3?\s*\)~i',$str,$matches); 
$images = $matches['image']; 
foreach($images as $img){ 
    echo $img; 
} 
# https://1.bp.blogspot.com/-6vpIH5iqPYs/WPzlNdxsRpI/AAAAAAAAntU/d7U_Ch_6FiIPwosNL4tWwqBeXw8qwo2nACLcB/s1600/1424051.jpg 

Answer 2

您可以使用DOMDocument和DOMXPath

$html = <<< EOF 
<div class="thumb"> 
       <a href="http://goruzont.blogspot.com/2017/04/blog-post_6440.html" style="background:url(https://1.bp.blogspot.com/-6vpIH5iqPYs/WPzlNdxsRpI/AAAAAAAAntU/d7U_Ch_6FiIPwosNL4tWwqBeXw8qwo2nACLcB/s1600/1424051.jpg) no-repeat center center;background-size:cover"> 

<span class="thumb-overlay"></span></a> 
</div> 
EOF; 

libxml_use_internal_errors(true); 
$dom = new DOMDocument(); 
$dom->loadHTML($html); 
$xpath = new DOMXPath($dom); 

foreach ($xpath->query('//div[contains(@class,"thumb")]/a') as $item) { 

    $img_src = $item->getAttribute('style'); 
    $img_src = preg_replace('/.*?\((.*?)\).*?/m', '$1', $img_src); 
    print $img_src; 
} 

# https://1.bp.blogspot.com/-6vpIH5iqPYs/WPzlNdxsRpI/AAAAAAAAntU/d7U_Ch_6FiIPwosNL4tWwqBeXw8qwo2nACLcB/s1600/1424051.jpg