Compare the keys of three arrays, and return the differences:

SUBMITTED BY: henry1874w

DATE: June 23, 2017, 9:20 p.m.

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

$result=array_diff_key($a1,$a2,$a3);
print_r($result);
?>