<?php
$ss = 2;
$max = 1000;
$arr = array(); // ?
echo $max."以内的素数为:";
while($ss < $max){
$boo = false;
foreach($arr as $value){ //?
if($ss % $value == 0){
$boo == true;
break;
}
}
if(!$boo){
echo $ss." ";
$arr[count($arr)] = $ss;
}
$ss++;
}
?>
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上面 1. $arr = array(); 意思是定义空数组吗?
2. foreach($arr as $value){ 如果上面数组是空数组,那历遍数组后$value的值分别是多少?
3. 数组array()的值是多少?