function str_toupper($str)
{
if(!is_string($str))
{
return $str;
}
$strOut = '';
$strArr = str_split($str,1);
foreach($strArr as $val)
{
if(ord($val) >= ord('a') && ord($val) <= ord('z'))
{
$strAscii = ord($val);
$strAscii += ord('A') - ord('a');
$val = chr($strAscii);
}
$strOut .= $val;
}
return $strOut;
}
function str_tolower($str)
{
if(!is_string($str))
{
return $str;
}
$strOut = '';
$strArr = str_split($str,1);
foreach($strArr as $val)
{
if(ord($val) >= ord('A') && ord($val) <= ord('Z'))
{
$strAscii = ord($val);
$strAscii += ord('a') - ord('A');
$val = chr($strAscii);
}
$strOut .= $val;
}
return $strOut;
}
