/PHP/Get the matched value from 2 array in php

Get the matched value from 2 array in php

$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"black","g"=>"purple");
$a3=array("a"=>"red1","b"=>"red","h"=>"yellow");

$result=array_intersect($a1,$a2,$a3);

// Output
// Array ( [a] => red )

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