How can PHP be used to automatically convert plain text URLs to clickable links?

To automatically convert plain text URLs to clickable links in PHP, you can use a regular expression to search for URLs in the text and replace them with HTML anchor tags. This can be done using the `preg_replace()` function in PHP.

<?php
function makeClickableLinks($text) {
    return preg_replace('/(https?:\/\/[^\s]+)/', '<a href="$1" target="_blank">$1</a>', $text);
}

$text = "Check out this website: https://www.example.com";
echo makeClickableLinks($text);
?>