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

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

<?php
$a=array("Volvo","BMW");
if (array_key_exists(0,$a))
{
    echo "Key exists!";
}
else
{
    echo "Key does not exist!";
}
?>