My API call returns the following JSON output before json_decode:

{
"projects": [
        {
            "project_id": 00000001,
            "name": "A title",
            "price": "0.99",
            "country": "US",
            "platform_types": [
                "android_phone",
                "ios_phone",
                "ios_tablet",
                "android_kindle",
                "android_tablet",
                "desktop"
            ],
            "comment": "A text of a comment"
        }
        {
            "project_id": 00000002,
            "name": "Another title",
            "price": "1.03",
            "country": "US",
            "platform_types": [
                "android_phone",
                "ios_phone",
                "ios_tablet",
                "android_kindle",
                "android_tablet",
                "desktop"
            ],
            "comment": "Another text of a comment"
        }
    ]
}

The following code parses the multi-level json and shows the whole projects list:

$json = file_get_contents($url, false, $context);
$result = json_decode($json, true);
foreach($result['projects'] as $project) {
    $project_id = $project['project_id'];
    $name = $project['name'];
    $price = $project['price'];
    $country = $project['country'];
    #no values for the fields, that's why commented
    #$android_phone = $project['platform_types']['android_phone'];
    #$ios_phone = $project['platform_types']['ios_phone'];
    #$ios_tablet = $project['platform_types']['ios_tablet'];
    #$android_kindle = $project['platform_types']['android_kindle'];
    #$android_tablet = $project['platform_types']['android_tablet'];
    #$desktop = $project['platform_types']['desktop'];
    $comment = $project['comment'];
    echo $project_id,'<br>',$name,'<br>',$price,'<br>',$country,'<br>',$comment,'<br>';
}

I got the following output:

00000001
A title
0.99
US
A text of a comment

00000002
Another title
1.03
US
Another text of a comment

The questions are:

1. How to list available device types (the fields have names only and no values)?
2. How to filter the array based on certain criteria (price must be equal or higher $1.00)?
3. How to filter elements based on fields without values (show projects just for Android devices)?

CodePudding user response：

Question 1

to list all the available device types per project as a json you should access it's corresponding tree

foreach($result['projects'] as $project) {
    $project_device_types = $project['plateform_type'];
    echo '<pre>'.$project_device_types.'<pre>';
}

Question 2

to filter the array use [array_filter][1] in

$filtered = array_filter($result['projects'], function($project) {
    if($project['price'] >= 90) {
      return true
    }
});
// use it instead of the $result variable
foreach($filtered as $project) {
    $project_id = $project['project_id'];
    $name = $project['name'];
    $price = $project['price'];
}

Question 3

you can follow the exact pattern as the second question and that is by using array_filter so eg. let's say you want only the android devices

array_filter($result['projects'], function($project) {
    if(in_array($project['platform_types'], "Android")) { // check if the plateform type include android by using [in_array][1]
      return true
    }
});

NB: in_array is case sensitive so make sure that the capitalization is correct