记录群里:
=1;$i--){
	$t = $arr[$i];
}
$end = get_microtime();
echo 'for:'. sprintf("%s",($end - $start));
$start = get_microtime();
foreach ($arr as $t){
	$f = $arr[$t];
}
$end = get_microtime();
echo '
foreach:'.sprintf("%s",($end - $start)); ?>

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