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【C201049】以下代码运行结果为？

<?php

$first = “This course is very easy !”;

$second = explode(” “,$first);

$first = implode(“,”, $second);

echo $first;

?>

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【C201049】以下代码运行结果为？ <?php $first = “This course is very easy !”; $second = explode(” “,$first); $first = implode(“,”, $second); echo $first; ?>