in_array() on multidimensional array
Solution 1:
Using in_array search for values, but in your code Peter is a key. Then you can use array_key_exists instead:
$people = array(
"Peter" => array (
"test" => 0
),
"Joe"
);
if (array_key_exists("Peter", $people))
{
echo "Match found";
}
else
{
echo "Match not found";
}
Output
Match found
you can combine both since the name you're searching is sometimes the value like "Joe" in your example.
if (array_key_exists("Peter", $people) || in_array("Peter", $people)) {
echo "Match found";
} else {
echo "Match not found";
}