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Grabbing the href attribute of an A element

我需要把包含一些字句的超文本文件的所有链接(始终不一样)。

例:

<a href="/bla:bla">BLA</a>
<a href="/link:link">BLA</a>
<a href="/link:bla">BLA</a>

我只需要与“href=/link:......”的联系。

$html = "SOME HTLM ";
$dom = new DomDocument();
@$dom->loadHTML($html);
$urls = $dom->getElementsByTagName( a );
foreach ($urls as $url)
{
    echo "<br> {$url->getAttribute( href )} , {$url->getAttribute( title )}";
    echo "<hr><br>";
}

在这个例子中,我需要具体的联系。

Answer 1

By using a condition.

<?php 
$lookfor= /link: ;

foreach ($urls as $url){
    if(substr($url->getAttribute( href ),0,strlen($lookfor))==$lookfor){
        echo "<br> ".$url->getAttribute( href )." , ".$url->getAttribute( title );
        echo "<hr><br>";
    }
}
?>

Answer 2

不要先点所有内容,然后过滤你所需要的内容,你可以直接通过:

//a[contains(@href, "link:")]

将在contain的文件中找到所有内容>。 The string link: in the hrefvide 。

检查母子(starts with 链接:你可以做些什么。

//a[starts-with(@href, "link:")]
Full example (demo):

$dom = new DomDocument(); $dom->loadHTML($html); $xpath = new DOMXPath($dom); foreach ($xpath->query( //a[contains(@href, "link:")] ) as $a) { echo $a->getAttribute( href ), PHP_EOL; }

也请见

Implementing condition in XPath

excluding URLs from path links?

PHP/XPath: find text node that "starts with" a particular string?

PHP Xpath : get all href values that contain needle

关于相关问题。

说明:由于许多相关问题,标识这一化学武器:

Answer 3

使用定期表述。

foreach ($urls as $url)
{
    $href = $url->getAttribute( href );
    if (preg_match("/^/link:/",$href){
        $links[$url->getAttribute( title )] = $href;
    }
}

链接阵列中包含所有与之相匹配的标题和手法。

Answer 4

既然只是让大家回来,那么你只需要检查一下从表面上开始的情况。

$href = $url -> getAttrubute ( href );
if (strpos ($href,  /link: ) === 0)
{
    // Do your processing here
}

Full example (demo):

友情链接