<?php
$get = '<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <input value="2530317381" name="X-Tmx-session-id" id="X-Tmx-session-id" type="hidden">
    <input value="2530317382" name="X-Tmx-session-id" id="X-Tmx-session-id" type="hidden">
    <input value="2530317383" name="X-Tmx-session-id" id="X-Tmx-session-id" type="hidden">
    <input value="2530317384" name="X-Tmx-session-id" id="X-Tmx-session-id" type="hidden">
</body>
</html>';

$doc = new DOMDocument();
@$doc->loadHTML($get);

$xpath = new DOMXpath($doc);
$doc = NULL;

$allInputs = $xpath->query('*/input[@id=\'X-Tmx-session-id\']');

foreach ($allInputs as $input) {
    echo 'valor do input: ', $input->getAttribute('value'), PHP_EOL;
}