The browser has printed out 6, but why is the error reported above?

Question

<?php

for($i=0;$i<5;$i ){

$a = $i;

}

echo $a;

?>

The browser has printed out 6, but why is the error reported above?

Answer 1

It is not defined the first time through the loop. The second time, $a has a value, so of course the result can be output.