Use strpos to search and then highlight the matched letters

Question

I want to perform a search on the $search string and then display the entire $search string with the matching letters highlighted.

This is the code so far:

//The user input
$user_input= $_POST['user_input'];

//The search
$search = 'Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.'; 

$match = strpos($search, $user_input);
echo '$match';

?>

Answer 1

    <?php

    //The search
    $testar = 'Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.'; 

    $match = str_replace($_POST['user_input'], '<b>' . $_POST['user_input'] . '</b>', $testar);
    echo $match;

     ?>