in_array() on multidimensional array

Question

I want to find an array inside an array by its value.

Example: It returns "Match not found", while "Peter" is inside the $people array. But I can found "Joe".

$people = array(
  "Peter" => array (
        "test" => 0
    ),
  "Joe"
);

if (in_array("Peter", $people))
  {
     echo "Match found";
  }
else
  {
     echo "Match not found";
  }

How can I found "Peter" in the array?

N69S · Accepted Answer · 2022-01-14 10:51:05Z

4

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";
}

edited Jan 14, 2022 at 10:51

N69S

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answered Jan 14, 2022 at 10:47

The fourth bird

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