function fixCase($str)
{
	$uc = 0;
	$lc = 0;
	for($i=0;$i<strlen($str);$i++)
	{
		if ($str[$i] >= 'a' && $str[$i] <= 'z')
			$lc++;
		else if ($str[$i] >= 'A' && $str[$i] <= 'Z')
			$uc++;
	}

	if ($uc == 0 || $lc == 0)
	{
		return ucwords(strtolower($str));
	}
}

function fixCase($str)
{
  if (
       (strcmp($str, strtolower($str)) === 0) ||
       (strcmp($str, strtoupper($str)) === 0) )
  {
    $str = ucwords(strtolower($str));
  }

  return $str;
}

// returns 0 if non-alphabetic char, 1 if uppercase, 2 if lowercase
function getCharType($char)
{
    if ($char >= 'A' && $char <= 'Z')
    {
        return 1;
    }
    else if ($char >= 'a' && $char <= 'z')
    {
        return 2;
    }
    else
    {
        return 0;
    }
}

function fixCase($str)
{
    for ($i = 0; $i < strlen($str); $i++)
    {
        $charType = getCharType($str[$i]);
        if ($charType != 0)
        {
            $firstCharType = $charType;
            break;
        }
    }

    for ($i = $i + 1; $i < strlen($str); $i++)
    {
        $charType = getCharType($str[$i]);
        if ($charType != $firstCharType && $charType != 0)
        {
            return $str;
        }
    }

    if ($firstCharType == 1) // uppercase, need to convert to lower first
    {
        return ucwords(strtolower($str));
    }
    else if ($firstCharType == 2) // lowercase, can just ucwords() it
    {
        return ucwords($str);
    }
    else // there were no letters at all in the string, just return it
    {
        return $str;
    }
}

function getStringCase($subject)
{
    if (!empty($subject))
    {
        if (preg_match('/^[^A-Za-z]+$/', $subject))
            return 0;   // no alphabetic characters
        else if (preg_match('/^[^A-Z]+$/', $subject))
            return 1;   // lowercase
        else if (preg_match('/^[^a-z]+$/', $subject))
            return 2;   // uppercase
        else
            return 3;   // mixed-case
    }
    else
    {
        return 0;   // empty
    }
}

function fixCase($str)
{
    return ucwords(strtolower($str));
}

function method1($str)
{
	if (strcmp($str, strtolower($str)) == 0)
	{
		return ucwords($str);
	}
	else if (strcmp($str, strtoupper($str)) == 0)
	{
		return ucwords(strtolower($str));
	}
	else
	{
		return $str;
	}
}

// returns 0 if non-alphabetic char, 1 if uppercase, 2 if lowercase
function getCharType($char)
{
	if ($char >= 'A' && $char <= 'Z')
	{
	    return 1;
	}
	else if ($char >= 'a' && $char <= 'z')
	{
	    return 2;
	}
	else
	{
	    return 0;
	}
}

function method2($str)
{
	for ($i = 0; $i < strlen($str); $i++)
	{
	    $charType = getCharType($str[$i]);
	    if ($charType != 0)
	    {
	        $firstCharType = $charType;
	        break;
	    }
	}

	for ($i = $i + 1; $i < strlen($str); $i++)
	{
	    $charType = getCharType($str[$i]);
	    if ($charType != $firstCharType && $charType != 0)
	    {
	        return $str;
	    }
	}

	if ($firstCharType == 1) // uppercase, need to convert to lower first
	{
	    return ucwords(strtolower($str));
	}
	else if ($firstCharType == 2) // lowercase, can just ucwords() it
	{
	    return ucwords($str);
	}
	else // there were no letters at all in the string, just return it
	{
	    return $str;
	}
}

function method0($str)
{
	    $uc = 0;
	    $lc = 0;
	    for($i=0;$i<strlen($str);$i++)
	    {
	            if ($str[$i] >= 'a' && $str[$i] <= 'z')
	                    $lc++;
	            else if ($str[$i] >= 'A' && $str[$i] <= 'Z')
	                    $uc++;
	    }

	    if ($uc == 0 || $lc == 0)
	    {
	            return ucwords(strtolower($str));
	    }
}


function test($func,$s)
{
	$start = gettimeofday(true);
	for($i = 0; $i < 1000000; $i++)
	{
		$s4 = $func($s);
	}
	$end = gettimeofday(true);
	echo "$func Time: " . ($end-$start) . " - Avg: ".sprintf("%.09f",(($end-$start)/1000000))."n";
}


$s1 = "first String";
$s2 = "second string";
$s3 = "THIRD STRING";

test("method0",$s1);
test("method0",$s2);
test("method0",$s3);

test("method1",$s1);
test("method1",$s2);
test("method1",$s3);

test("method2",$s1);
test("method2",$s2);
test("method2",$s3);

method0 Time: 19.2899270058 - Avg: 0.000019290
method0 Time: 20.8679389954 - Avg: 0.000020868
method0 Time: 24.8917310238 - Avg: 0.00002489
method1 Time: 3.07466816902 - Avg: 0.000003075
method1 Time: 2.52559089661 - Avg: 0.000002526
method1 Time: 4.06261897087 - Avg: 0.000004063
method2 Time: 19.2718701363 - Avg: 0.000019272
method2 Time: 35.2485661507 - Avg: 0.000035249
method2 Time: 29.3357679844 - Avg: 0.000029336