error Trying to access array offset on value of type float

Question

I have this code:

<?php
$url = 'https://marine-api.open-meteo.com/v1/marine? 
latitude=10.307&longitude=-85.839&daily=wave_height_max,wind_wave_height_max&timezone=auto';
$data = file_get_contents($url);
$array = json_decode($data, true);

echo "<table>";

foreach($array as $key => $value) {
    echo "<tr>";
    echo "<td>" . $value["time"] . "</td>";
    echo "<td>" . $value["wave_height_max"] . "</td>";
    echo "<td>" . $value["wind_wave_height_max"] . "</td>";
    echo "</tr>";
}
echo "</table>";
?>

and I am getting

Trying to access array offset on value of type float

error

The JSON is:

{
    "latitude": 10.0,
    "longitude": -86.0,
    "generationtime_ms": 0.6439685821533203,
    "utc_offset_seconds": -21600,
    "timezone": "America/Costa_Rica",
    "timezone_abbreviation": "CST",
    "daily_units": {
        "time": "iso8601",
        "wave_height_max": "m",
        "wind_wave_height_max": "m"
    },
    "daily": {
        "time": ["2023-03-09", "2023-03-10", "2023-03-11", "2023-03-12", "2023-03-13", "2023-03-14", "2023-03-15"],
        "wave_height_max": [1.34, 1.14, 1.38, 1.70, 1.84, 1.72, 1.72],
        "wind_wave_height_max": [0.14, 0.26, 0.16, 0.40, 0.74, 0.22, 0.10]
    }
}

The first item of the resulting array, that you are looping over, has the key `latitude` and the value `10.0`. Trying to access `$value["time"]` of course makes no sense with that value. — CBroe, Mar 09 '23 at 14:50
Well you've got a single object there, not an array...so you can't loop it the way you're expecting. Looks like you actually wanted to loop the "daily" values, but that's not an array either, it's an object which contains a set of separate arrays. — ADyson, Mar 09 '23 at 14:50
Have a read of [How to extract and access data from JSON with PHP?](https://stackoverflow.com/questions/29308898/how-to-extract-and-access-data-from-json-with-php) and then make sure you understand what the JSON you're looking at there actually represents. If you find it easier to read PHP array syntax, then run `var_export($array);` after you've created it, so you understand the structure you're dealing with. — ADyson, Mar 09 '23 at 14:51
@ADyson, Mariano has always been calling `json_decode($data, true)` -- this will be creating arrays, not objects. The json encoded format, of course, looks like objects. — mickmackusa, Mar 10 '23 at 02:19
@mickmackusa indeed. my comment referred to the JSON structure, not the resulting php variable, probably should have made that clearer :-) — ADyson, Mar 10 '23 at 08:01

score 1 · Answer 1 · answered Mar 09 '23 at 14:48

You should update your code to access wave_height_max and wind_wave_height_max values from the daily :

<?php
$url = 'https://marine-api.open-meteo.com/v1/marine?latitude=10.307&longitude=-85.839&daily=wave_height_max,wind_wave_height_max&timezone=auto';
$data = file_get_contents($url);
$array = json_decode($data, true);

echo "<table>";

foreach($array["daily"]["time"] as $key => $value) {
    echo "<tr>";
    echo "<td>" . $value . "</td>";
    echo "<td>" . $array["daily"]["wave_height_max"][$key] . "</td>";
    echo "<td>" . $array["daily"]["wind_wave_height_max"][$key] . "</td>";
    echo "</tr>";
}
echo "</table>";
?>

error Trying to access array offset on value of type float

1 Answers1