在PHP中创建一个带有数组的json？

I tried to implement it something like this

private static function getData($datas) {

    $days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    $days_aliases = ['SUN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT'];

    $open_rates = array();

    foreach ($datas as $data) {

        $date = Carbon::parse($data->created_at)->format('l');

        for($i = 0; $i < count($days); $i++) {

            if($date == $days[$i]){

                $open_rates['x'][$i] = $days_aliases[$i];
                $open_rates[$data->name][$i] = (int)$data->open_rate;

            } 

        }

    }

    return $open_rates;

}

But the result is like this.

{ "x": { "0": "SUN", "1": "MON", "2": "TUE", "3": "WED", "4": "THU", "5": "FRI", "6": "SAT" } }

How to make an array like this PHP?

json: {
    'Day Pass' : [40, 10, 99, 50],
    'Day Pass' : [40, 10, 99, 50],
    'Day Pass' : [40, 10, 99, 50],
    'Day Pass' : [40, 10, 99, 50],
    'Day Pass' : [40, 10, 99, 50]
    }

Simply create a numeric-indexed array. Note that you can't have multiple keys with the same name in an array, so you need different names for "Day pass", otherwise you'd be overwriting them:

<?php
$json = [
    "json" => [
        "Day pass" => 
            [40, 10, 99, 50],
        "Day pass2" => 
            [40, 10, 99, 50],
        "Day pass3" => 
            [40, 10, 99, 50],
        "Day pass4" => 
            [40, 10, 99, 50],
    ],
];
print_r(json_encode($json));

Gives the correct result:

{
    "json": {
        "Day pass": [40, 10, 99, 50],
        "Day pass2": [40, 10, 99, 50],
        "Day pass3": [40, 10, 99, 50],
        "Day pass4": [40, 10, 99, 50]
    }
}

Demo

Using the same key instead, gives you one item:

<?php
$json = [
    "json" => [
        "Day pass" => 
            [40, 10, 99, 50],
        "Day pass" => 
            [40, 10, 99, 50],
        "Day pass" => 
            [40, 10, 99, 50],
        "Day pass" => 
            [40, 10, 99, 50],
    ],
];
print_r(json_encode($json));

Result:

{
    "json": {
        "Day pass": [40, 10, 99, 50]
    }
}

Demo

The problem with your specific code is that, in order to have json_encode() return a JSON array (instead of an object), the PHP array needs to be a numeric sequential 0-indexed array. What you can do is pass the array through array_values() in order to only preserve the values and reset the keys:

<?php
$open_rates = [];
$open_rates["x"]["0"] = "Sun";
$open_rates["x"]["2"] = "Mon";
var_dump(json_encode($open_rates)); // JSON object
$open_rates["x"] = array_values($open_rates["x"]);
var_dump(json_encode($open_rates)); // JSON array

Demo

The example that you have written is wrong. Object cannot have same key repeated. So assuming that key is different it should be something like this in PHP:

$json = array(‘day pass’ => array(40,10,99,50), ‘day pass2’ => array(20,30,30))

The json you gave is not a valid json, keys shouldn't repeat inside a valid json

Assuming you meant:

json: {
    'Day Pass 1' : [40, 10, 99, 50],
    'Day Pass 2' : [40, 10, 99, 50],
    'Day Pass 3' : [40, 10, 99, 50],
    'Day Pass 4' : [40, 10, 99, 50],
    'Day Pass 5' : [40, 10, 99, 50]
}

It can be written in php as

<?php
$json = array(
    "json" => array(
        "Day Pass 1" => array(40, 10, 99, 50),
        "Day Pass 2" => array(40, 10, 99, 50),
        "Day Pass 3" => array(40, 10, 99, 50),
        "Day Pass 4" => array(40, 10, 99, 50),
        "Day Pass 5" => array(40, 10, 99, 50)
    )
)