Both the $myVar assignment in line 1 and the $higher assignment in line 2
are dead. The first because $myVar is never used and the second because
$higher is always overwritten for every possible time line.
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38
1
$class = get_called_class();
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1
if (!array_key_exists($class, self::$instance) || null === self::$instance[$class]) {
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self::$instance[$class] = new $class(func_get_args());
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.