<!DOCTYPE html>
<html>
<body>

<?php
$str = "This is nice";
echo strlen($str)." "; // Using strlen() to return the string length
echo substr_count($str,"is")." "; // The number of times "is" occurs in the string
echo substr_count($str,"is",2)." "; // The string is now reduced to "is is PHP"
echo substr_count($str,"is",3)." "; // The string is now reduced to "s is PHP"
echo substr_count($str,"is",3,3)." "; // The string is now reduced to "s i"
?>

</body>
</html>