How to get the value of the href attribute?
With the help of XPath, how to get the value of the href attribute in the following case (only grabbing the url that is the right one)?:
<a href="http://foo.com">a wrong one</a>
<a href="http://example.com">the right one</a>
<a href="http://boo.com">a wrong o开发者_JS百科ne</a>
That is, to get the value of the href attribute if the link has a particular text.
This will select the attributes:
"//a[text()='the right one']/@href"
i think this is the best solution, you can use each of them as an array element
$String= '
<a href="http://foo.com">a wrong one</a>
<a href="http://example.com">the right one</a>
<a href="http://boo.com">a wrong one</a>
';
$array=get_all_string_between($String,'href="','">');
print_r($array);//just to see what is inside the array
//now get each of them
foreach($array as $value){
echo $value.'<br>';
}
function get_all_string_between($string, $start, $end)
{
$result = array();
$string = " ".$string;
$offset = 0;
while(true)
{
$ini = strpos($string,$start,$offset);
if ($ini == 0)
break;
$ini += strlen($start);
$len = strpos($string,$end,$ini) - $ini;
$result[] = substr($string,$ini,$len);
$offset = $ini+$len;
}
return $result;
}
"//a[@href='http://example.com']"
I'd use an opensource class like simple_html_dom.php
$oHtml = new simple_html_dom();
$oHtml->load($sBody)
foreach($oHtml->find('a') as $oElement) {
echo $oElement->href
}
Here's a full example using SimpleXML:
$xml = '<html><a href="http://foo.com">a wrong one</a>'
. '<a href="http://example.com">the right one</a>'
. '<a href="http://boo.com">a wrong one</a></html>';
$tree = simplexml_load_string($xml);
$nodes = $tree->xpath('//a[text()="the right one"]');
$href = (string) $nodes[0]['href'];
加载中,请稍侯......
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