how replace one array to second array?

Question

ex a{1,2,3,4} replace{1,0,1,0}

Answer 1

$a = $replace;

Answer 2

please explain shortly francis ...any example

Answer 3

for ($i=0; $i<length($a); $i++) {$a[$i] = $replace[$i];} check 'for', maybe I write it wrong

Answer 4

your for is good except is count($a) if $a is an array