6: 考虑下面的代码片段。<?phpdefine("STOP_AT",1024);$result = array();/*在此处填入代码*/{$result[] = $idx;}print_r($result );?>标记处填入什么代码才能产生如下数组输出？( )Array( [0] => 1 [1] => 2 [2] => 4 [3] => 8[4] => 16[5] => 32 [6] => 64 [7] => 128 [8] => 256 [9] => 512)
A: for($idx *= 1；$idx < STOP_AT；$idx *= 2)
B: foreach($result as $key => $val)
C: while($idx *= 2)
D: for($idx *= 2；STOP_AT >= $idx；$idx =0))
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