PHP: Replace space in front of capitals in a string (Regex)

I have a number of strings which contain words which are bunched together and I need to seperate them up.

For example ThisWasCool - This Was Cool MyHomeIsHere - My Home Is Here 

$String = 'TheCambodia';
$Words = preg_replace('/(?<!\ )[A-Z]/', ' $0', $String);
echo $Words;


Output: The Cambodia

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