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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function invertCase($text)
{
// BEGIN (write your solution here)
$result = '';
$toUpper = '';
for ($i = 0; $i < mb_strlen($text); $i++) {
$toUpper = mb_strtoupper(mb_substr($text, $i, 1));
if ($toUpper === $text[$i]) {
$result .= mb_strtolower(mb_substr($text, $i, 1));
} else {
$result .= mb_strtoupper(mb_substr($text, $i, 1));
}
}
return $result;
// END
}