Online PHP editor | output for Ut8Dr

@ 2020-02-04T22:53:10Z

<?php

$html = <<<HTML
<div>
<img src="/relative/url/img.jpg" />
<form action="/"></form>
<form action="/contact-us/"></form>
<a href='/relative/url/'>Note the Single Quote</a>
<img src="//example.com/protocol-relative-img.jpg" />
</div>
HTML;

$domain = '//example.com';
$targets = [
    "//img[not(starts-with(@src, '//'))]",
    "//form[not(starts-with(@action, '//'))]",
    "//a[not(starts-with(@href, '//'))]"
];

$dom = new DOMDocument; 
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach ($xpath->query(implode('|', $targets)) as $node) {
    if ($src = $node->getAttribute('src')) {
        $node->setAttribute('src', $domain . $src);
    } elseif ($action = $node->getAttribute('action')) {
        $node->setAttribute('action', $domain . $action);
    } else {
        $node->setAttribute('href', $domain . $node->getAttribute('href'));
    }
}
echo $dom->saveHTML();

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: <div> <img src="//example.com/relative/url/img.jpg"> <form action="//example.com/"></form> <form action="//example.com/contact-us/"></form> <a href="//example.com/relative/url/">Note the Single Quote</a> <img src="//example.com/protocol-relative-img.jpg"> </div>
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/Ut8Dr on line 14
Process exited with code 255.
Output for 4.4.2, 5.1.2: Parse error: syntax error, unexpected '[' in /in/Ut8Dr on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/Ut8Dr on line 14
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/Ut8Dr on line 14
Process exited with code 255.

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