Question

How to invert the letters case in a String uppercase to lowercase and lowercase to uppercase in PHP

Answer 1

$s = "pHP Programming";
$s =  InvertLettersCase($s);
echo $s . "<br />";

echo InvertLettersCase("Python") . "<br />";;

function InvertLettersCase($s) 
{
   $s =  strtolower($s) ^ strtoupper($s) ^ $s;
   
   return $s;
}

 

/*
run:
  
Php pROGRAMMING
pYTHON
  
*/

 

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