I'm trying to settle dynamic title for any page equal to search input value

Question

<input type="text" class="form-control" placeholder="" id="sample" value="" name="sample" />
<title><?php echo $value ?></title>

so as I said before I'm trying to settle dynamic title for any page equal to search input value

Answer 1

Generally, a search query is a value set in the query-string of the current URL, such as:

/search?query=pizza

In PHP, you can access this via the $_GET superglobal:

<?php echo $_GET['query']; ?>

If there isn't a query set, this on its own may lead to a warning/error, so you'll want to verify it's set first:

<title>
    Search
    <?php
    if (isset($_GET['query'])) {
        echo ' - ' . $_GET['query'];
    }
    ?>
</title>

Warning: Make sure to always sanitize the output first though, otherwise you could introduce security vulnerabilities such as Cross-Site-Scripting (XSS). To sanitize, try htmlentities(), for example.

<?php echo htmlentities($_GET['query']); ?>