Compare the keys of two indexed arrays, and return the matches:

SUBMITTED BY: henry1874w

DATE: June 23, 2017, 9:32 p.m.

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<?php
$a1=array("red","green","blue","yellow");
$a2=array("red","green","blue");

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