PHP，json_decode，数组问题

Question

I have a multi-dimensional associative array that is encoded into JSON for database storage, and then decoded for display. I am having trouble accessing the resulting array elements.

An example JSON string:

{
    "service": "Star Break Repair",
    "options": {
        "Buy with me -60": "-60.00",
        "Bulseye Break Repair": "30.00"
    }
}

After decoding this using json_decode($array, true) (true gets an array, not an object), I get an array as expected:

Array
(
    [service] => Star Break Repair
    [options] => Array
        (
            [Buy with me -60] => -60.00
            [Bulseye Break Repair] => 30.00
        )

)

But when I try and echo a specific element:

echo @key($services['options'][0]);

or

echo $services['options'][0];

I get nothing, blank.

When I try to:

key($services['options'][0])

I get this error:

key() [function.key]: Passed variable is not an array or object in... 

I've tried saving the options array as its own PHP variable, and the same thing happens. I can print_r() either array (the original with the nested options array, or just the options array), but when I try and print a specific element, nothing happens. When I try and print the element key, I get that PHP error.

What's going on?

Answer 1

The issue is that you have an associative array for your options, not an integer-indexed array.

So, if you want to access the elements of options you need to refer to them by their string keys:

$foo = $services['options']['Buy with me -60'];
$bar = $services['options']['Bulseye Break Repair'];

Now, if you don't know the keys, you can use a foreach loop to iterate over your options array:

foreach($services['options'] as $okey=>$oval) {
    echo $okey; //'Buy with me -60', 'Bulseye Break Repair'
    echo $oval; //'-60.00', '30.00'
}