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PHP網路爬蟲之抓取meta value

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2014-10-16Chung

最近在研究著如何抓取網頁中的meta值...

php中的get_meta_tags函式可以抓取meta name 範例如下...

$tags = get_meta_tags('http://www.example.com/');

echo $tags['author']; // name

echo $tags['keywords']; // php documentation

echo $tags['description']; // a php manual

echo $tags['generator']; // 49.33;-86.59

$sites_html = file_get_contents('http://www.example.com/');



$html = new DOMDocument();

@$html->loadHTML($sites_html);

$meta_og_img = null;

$meta_og_title = null;

//Get all meta tags and loop through them.

foreach($html->getElementsByTagName('meta') as $meta) {

//If the property attribute of the meta tag is og:image

if($meta->getAttribute('property')=='og:image'){

//Assign the value from content attribute to $meta_og_img

$meta_og_img = $meta->getAttribute('content');

}

if($meta->getAttribute('property')=='og:title'){

//Assign the value from content attribute to $meta_og_title

$meta_og_title = $meta->getAttribute('content');

}

}

echo '<img src=' . $meta_og_img . ' /> <br/>';

echo $meta_og_title ;