PHP 获取指定URl页面中所有链接

1. //获取指定URL页面中所有链接
2. function get_url_href($url){
3. $html = file_get_contents($url);
4. $dom = new DOMDocument();
5. @$dom->loadHTML($html);
6. $xpath = new DOMXPath($dom);
7. $hrefs = $xpath->evaluate('/html/body//a');
8. for($i=0;$ilength;$i++){
9. $href = $hrefs->item($i);
10. $url = $href->getAttribute('href');
11. if(substr($url,0,4) == 'http') echo $url.'
    ';
12. }
13. }

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PHP, URl