<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5");
if (array_key_exists("Volvo",$a))
&nbsp;&nbsp;  {
&nbsp;&nbsp;  echo "Key exists!";
&nbsp;&nbsp;  }
else
&nbsp;&nbsp;  {
&nbsp;&nbsp;  echo "Key does not exist!";
&nbsp;&nbsp;  }
?>