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並前往https://teamtreehouse.com/community/how-to-define-a-specific-key-and-get-the-value-in-associative-array-foreach-loop

How to define a specific key and get the value in associative ...

I would try the code below first, then try your code with the this inside the foreach loop: echo key($x_value);. <?php foreach ($age as $x) ...

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