for 和foreach 到底谁快？

<?php
 
$count=100000;
$arr=range(1,$count,1);
$ts = microtime(true);
for ($i = 0; $i <$count; $i++) {
    $arr[$i]=$i+1;
}
$time =microtime(true)-$ts;
echo($time.PHP_EOL);
 
 
//foreach
$arr=range(1,$count,1);
$ts = microtime(true);
foreach ($arr as $key => $value) {
 $arr[$key] = $value + 1;
}
 
$time =microtime(true)-$ts;
echo($time.PHP_EOL);
 
?>