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
$higher is always overwritten for every possible time line.
It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.
If the size of the collection does not change during the iteration, it is
generally a good practice to compute it beforehand, and not on each iteration:
for($i=0;$i<count($array);$i++){// calls count() on each iteration}// Betterfor($i=0,$c=count($array);$i<$c;$i++){// calls count() just once}
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.