PHP quiz. Using which PHP function can you check if several

Using which PHP function can you check if several dates are valid Gregorian dates?

The checkdate() function is used to validate a Gregorian date.

";
var_dump(checkdate(2,29,2003));
echo "
";
var_dump(checkdate(2,29,2004));
?>

Result:

bool(false) 
bool(false) 
bool(true)

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