多重循环下怎么防止变量超过数组索引

多重循环下如何防止变量超过数组索引

PHP code

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$arr = array(
    "0" => "test",
    "1" => "test1",
    "2" => "test2"
);

$num = count($arr);

for($i=0;$i

------解决方案--------------------
foreach ($arr as $index => $value)