See how it sorts when two values are the same:

SUBMITTED BY: henry1874w

DATE: June 25, 2017, 2:30 p.m.

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<?php
$a1=array("Dog","Dog","Cat");
$a2=array("Pluto","Fido","Missy");
array_multisort($a1,$a2);
print_r($a1);
print_r($a2);
?>