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We can change all characters to lower case by using strtolower. The following code is an example.

 

<?php

$string = 'I am ThEt NainG WiN!';

$string_low = strtolower($string);

echo $string_low;

?>

 
We can also change all characters to upper case by using strtoupper. The following is an example.

<?php

$string = 'I am ThEt NAInG win!';

$string_up = strtoupper($string);

echo $string_up;

?>


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