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<?php
 
$a1 = ['a', 'b', 'c'];
$a2 = ['a'=>10, 'b'=>20, 'c'=>30,'d' => 40];
 
print_r(array_intersect_key($a2, array_flip($a1)));

Success #stdin #stdout 0.02s 83008KB

stdin

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Standard input is empty

stdout

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Array
(
    [a] => 10
    [b] => 20
    [c] => 30
)

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