Question

I am reading a source code of a page in PHP. There is an hidden input field <input type="hidden" name="session_id" value= in that page.

$url = 'URL HERE';
$needle = '<input type="hidden" name="session_id" value=';
$contents = file_get_contents($url);
if(strpos($contents, $needle)!== false) {
echo 'found';
} else {
echo 'not found';
}

I want to read that hidden field value.

Answer 1

By far the best way to do this is with the DOM extension to PHP.

$dom = new DOMDocument;
$dom->loadHtmlFile('your URL');

$xpath = new DOMXPath($dom);

$elements = $xpath->query('//input[@name="session_id"]');
if ($elements->length) {
    echo "found: ", $elements->item(0)->getAttribute('value');
} else {
    echo "not found";
}