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TypeError

count(): Argument #1 ($value) must be of type Countable|array, string given

$_GET = [
    'lang' => 'en',
    'specialist' => 'ophthalmologist',
    'country' => 'poland',
    'city' => 'warsaw',
    'slug' => 'dr-agnieszka-siennicka-e57e36c7db6a56',
];