What is best way to test uppercase or lowercase type of a given character in php?

What is an ideal way to detected if a character is uppercase or lowercase, regardless of the fact of the current local language.

Is there a more direct function?

Assumptions: Set internal character encoding to UTF-8 & Local browser session is en-US,en;q=0.5 & Have installed Multibyte String extension. Do not use ctype_lower, or ctype_upper.

See below test code that should be multibyte compatible.

$encodingtype = 'utf8';
$charactervalue = mb_ord($character, $encodingtype);

$characterlowercase = mb_strtolower($character, $encodingtype) ;
$characterlowercasevalue = mb_ord(mb_strtolower($character, $encodingtype));

$characteruppercase = mb_strtoupper($character, $encodingtype);
$characteruppercasevalue = mb_ord(mb_strtoupper($character, $encodingtype));



// Diag Info
echo 'Input: ' . $character . "<br />";
echo 'Input Value: ' . $charactervalue = mb_ord($character, $encodingtype) . "<br />" . "<br />";
echo 'Lowercase: ' . $characterlowercase = mb_strtolower($character, $encodingtype) . "<br />";
echo 'Lowercase Value: ' . $characterlowercasevalue = mb_ord(mb_strtolower($character, $encodingtype)) . "<br />" . "<br />";
echo 'Uppercase: ' . $characteruppercase = mb_strtoupper($character, $encodingtype) . "<br />";
echo 'Uppercase Value: ' . $characteruppercasevalue = mb_ord(mb_strtoupper($character, $encodingtype)) . "<br />" . "<br />";
// Diag Info


if ($charactervalue == $characterlowercasevalue and $charactervalue != $characteruppercasevalue){
    $uppercase = 0;
    $lowercase = 1;
    echo 'Is character is lowercase' . "<br />" . "<br />";
}

elseif ($charactervalue == $characteruppercasevalue and $charactervalue != $characterlowercasevalue ){
    $uppercase = 1;
    $lowercase = 0;
    echo 'Character is uppercase' . "<br />" . "<br />";
}

else{
    $uppercase = 0;
    $lowercase = 0;
    echo 'Character is neither lowercase or uppercase' . "<br />" . "<br />";
}

• // Test 1 A // Output-> Character is uppercase
• // Test 2 z // Output-> Character is lowercase
• // Test 3 + // Output-> Character is lowercase
• // Test 4 0 // Output-> Character is neither lowercase or uppercase
• // Test 5 ǻ // LATIN SMALL LETTER A WITH RING ABOVE AND ACUTE // Output-> Character is lowercase
• // Test 6 Ͱ GREEK CAPITAL LETTER HETA // Output-> Character is uppercase
• // Test 7 '' NULL // Output-> Character is neither lowercase or uppercase