In PHP, we can check if a value exists in an array by using in_array() function.

Syntax:

in_array(search, array, type)
  • search: Required. Specifies the what to search for.
  • array: Required. Specifies the array to search.
  • type: Optional. If this parameter is set to TRUE, the in_array() function searches for the search-string and specific type in the array.

Example:

$users = ['Sandeep', 'Kohli', 'Messi'];
$name = trim(fgets(STDIN));

if (in_array($name, $users)) {
    echo "$name is an user.";
} else {
    echo "$name is not an user.";
}

Output: