Add case_insensitive option for search queries — defaults to false for backward compatibility. (See #22)

You can set it to true in your options amongst columns and keywords. For example, in the config/search-string.php file:

return [
    'default' => [
        'case_insensitive' => true, // <- Globally.
        // ...
    ],

    Article::class => [
        'case_insensitive' => true, // <- Only for the Article class.
        // ...
    ],
];

When set to true, it will lowercase both the column and the value before comparing them using the like operator.

$value = mb_strtolower($value, 'UTF8');
$query->whereRaw("LOWER($column) LIKE ?", ["%$value%"]);