在php数组的exits中查找

$array = array(
    "name" => "John",
    "age" => 30,
    "city" => "New York"
);

if (array_key_exists("name", $array)) {
    echo "The 'name' key exists in the array.";
} else {
    echo "The 'name' key does not exist in the array.";
}

The 'name' key exists in the array.