PHP in_array or maching element's value in array

Hello, I'm trying to match element's value in array with in_array function as shown below.
It doesn't have to be in_array to acomplish this.
But, so far it doesn't work that I expected.
Please help.

Thank you.
$a = array("a", "b", "c");
$b = array("a", "z", "b",  "c", "d");
 
if (in_array($b, $a))
    echo "Found";
 
Actually, I need to acomplish:
 
"If ALL of $a array's elements found in array $b then reurn true."

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eb110kAsked:
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eb110kAuthor Commented:
Thank you for your quick response.
I found a perfect solution in the article.
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