<?php
$str = "India is the best";
$str = strtoupper($str);
echo $str;
echo '<br>';
$str1 = "INDIA IS THE BEST";
$str1 = strtolower($str1);
echo $str1;
?>

**********
//output

INDIA IS THE BEST // All string to Uppercase

india is the best All string to Lowercase


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