<a href>使用php</a>检索<a href>标签的</a>多个值

Question

I need to extract the link value which is stored in a <a> tag by using php code.

I used below code

$url = '<a title="Question" href="http://stackoverflow.com/questions/ask">t</a>';
preg_match("/href=\"(.*?)\"/i", $url, $matches);
print_r($matches);

With the above code I can able to get the value of a single href. But it is not working for multiple href in a string(ie $url = '<a title="Question" href="http://stackoverflow.com/questions/ask">t</a><a href="x.php">x</a>';) . How can I achieve this?

Answer 1

Use preg_match_all() to get all the matches, not just the first.

$url = '<a title="Question" href="http://stackoverflow.com/questions/ask">t</a>&nbsp;<a href="x.php">x</a>';
preg_match_all("/href=\"(.*?)\"/i", $url, $matches);
print_r($matches);

Answer 2

Use a DOM parser, this example should get you going:

<?php
$doc = new DOMDocument();
$doc->loadHTML('<a title="Question" href="http://stackoverflow.com/questions/ask">t</a>');

$elm = $doc->getElementsByTagName('a')->item(0);

foreach ($elm->attributes as $attr) {
    echo $attr->name . ' ' . $attr->value . '<br>';
}

echo "Directly getting href: " . $elm->attributes->getNamedItem('href')->value;

Output:

title Question
href http://stackoverflow.com/questions/ask
Directly getting href: http://stackoverflow.com/questions/ask 

Demo: http://viper-7.com/EN1Usi

Docs: http://php.net/manual/en/class.domdocument.php