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

SUBMITTED BY: henry1874w

DATE: June 23, 2017, 9:18 p.m.

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<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","c"=>"blue","d"=>"pink");

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