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以下foreach語法正確的有哪些？

foreach($a as $v ){}

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

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

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

填空，遍歷出數(shù)組里的所有學生年齡，并且一一對應。

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

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