encode_json.php

<?php

if(!function_exists('encode_json')) {
    function encode_json( $var ) {
        static $options = null;
        if (is_null($options)) {
            $options = 0;
            if (version_compare(PHP_VERSION, '5.3.3') >= 0)
                $options |= JSON_NUMERIC_CHECK;
            if (version_compare(PHP_VERSION, '5.4.0') >= 0)
                $options |= JSON_UNESCAPED_SLASHES|JSON_UNESCAPED_UNICODE;
        }
        return json_encode($var, $options);
    }
}

$response = [
    [
        '0' => '不分區',
        'north' => '北',
        'east' => '東',
        'west' => '西',
        'middle' => '中',
        'south' => '南',
    ],
];

echo encode_json($response).PHP_EOL;