invert case

jvit

echo invertCase('invert CaSe');

// result: INVERT cAsE

Shortcut: invert

/**
* Uppercase to lowercase and lowercase to uppercase(ASCII string only).
*
* @param  string $value
* @return string
*/
function invertCase($value)
{
  return strtolower($value) ^ strtoupper($value) ^ $value;
}