foreach는 연관 배열을 트래버스합니다._php.cn趣课

以下foreach语法正确的有哪些？

foreach($a as $v ){}

foreach{$a as $k=>$v}()

Foreach($a as $k=>$v){}

foreach($a as $k=>$v)()

填空，遍历出数组里的所有学生年龄，并且一一对应。

<?php $boy = [ 'xiaoming' => 18,'xiaoliang' => 19, ]; foreach($boy $k $v){echo $k.'年龄是'.. '<br />'; } ?>

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