PHP - Prepend a url to all links with no http or https
Relatively new to php and looking for some help in updating links on a specific page. The page has numerous links eg. href=/link/ and I would like to code the page to identify these links (links that do not already have http or https) and prepend with a url eg. www.domain.com to each. Basically ending up with href=www.domain.com/l开发者_如何转开发ink/. Any help would be greatly appreciated.
I think you want to parse a list of URLs and prepend "http://" to the ones that don't have it.
<?php
$links = array('http://www.redditmirror.cc/', 'phpexperts.pro', 'https://www.paypal.com/', 'www.example.com');
foreach ($links as &$link)
{
// Prepend "http://" to any link missing the HTTP protocol text.
if (preg_match('|^https*://|', $link) === 0)
{
$link = 'http://' . $link . '/';
}
}
print_r($links);
/* Output:
Array
(
[0] => http://www.redditmirror.cc/
[1] => http://phpexperts.pro/
[2] => https://www.paypal.com/
[3] => http://www.example.com/
)
*/
Maybe it suffices to just change the base URI of the document with the BASE element:
<base href="http://example.com/link/">
With this the new base URI is http://example.com/link/ instead of the URI of the document. That means, every relative URI is resolved from http://example.com/link/ instead of the document’s URI.
You could always use output buffering at the top of your page with a callback that reformats your hrefs to how you'd like them:
function callback($buffer)
{
return (str_replace(' href="/', ' href="http://domain.com/', $buffer));
}
ob_start('callback');
// rest of your page goes here
ob_end_flush();
Because you left out critical details in your first question, here is the second answer.
Doing what @Nev Stokes says may work, but it will also get more than tags. You should never use regular expressions (or, worse, strp_replace) on HTML.
Instead, use the file_get_html() library and do this:
<?php
require 'simplehtmldom/simple_html_dom.php';
ob_start();
?>
<html>
<body>
<a id="id" href="/my_file.txt">My File</a>
<a name="anchor_link" id="boo" href="mydoc2.txt">My Doc 2</a>
<a href="http://www.phpexperts.pro/">PHP Experts</a>
</body>
</html>
<?php
$output = ob_get_clean();
$html = str_get_html($output);
$anchors = $html->find('a');
foreach ($anchors as &$a)
{
if (preg_match('|^https*://|', $a->href) === 0)
{
// Make sure first char is /.
if ($a->href[0] != '/')
{
$a->href = '/' . $a->href;
}
$a->href = 'http://www.domain.com' . $a->href;
}
}
echo $html->save();
Output:
<html>
<body>
<a id="id" href="http://www.domain.com/my_file.txt">My File</a>
<a name="anchor_link" id="boo" href="http://www.domain.com/mydoc2.txt">My Doc 2</a>
<a href="http://www.phpexperts.pro/">PHP Experts</a>
</body>
</html>
加载中,请稍侯......
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