Efficiency source hard disk bad sector detection software PHP address reference PHP address reference efficiency problem

Copy the code The code is as follows:

echo 'begin time:'.$begin=microtime(false).'
';//begin to count time
$ array=array();
for ($i=1;$i<=10000;$i++) {//Generate a large array
$array[$i]=$i;
}
/*
$ arr=$array;//Total copy and print time 0.02
foreach ($arr as $ar) {
echo $ar.'
';
}
*/
/*
$newarr= &$array;//The address reference time is always controlled within 0.01. The advantage of address reference is reflected
foreach ($newarr as $r) {
echo $r.'
';
}
*/
foreach ($array as $a) {//Basically 0.02, rarely 0.01 Why is it not as fast as address reference? Wondering
echo $a.'
';
}
echo 'end time:'.$end=microtime(false).'
';//end to count time
echo 'total time:'.($end-$begin);
?>

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