You want to reverse the words or the bytes in a string.
Use strrev() to reverse by byte.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
$username = 'John Doe is anonymous';
echo $username, "<br />";
// reverse by byte
echo strrev($username), "<br />";
// reverse by words
// break the string up into words
$words = explode(' ', $username);
// reverse the array of words
$words = array_reverse($words);
//rebuild the string
$username = implode(' ', $words);
echo $username, "<br />";
?>
</p>
</body>
</html>
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