<?php
// Initialize the cURL session
$ch = curl_init('https://c...content-available-to-author-only...e.com/api/challenges/json/age-counting');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, 0);
$data = curl_exec($ch);
curl_close($ch);
 
// Decode the JSON response
$data = json_decode($data, true);
 
// Split the 'data' string by commas to process each key-value pair
$entries = explode(',', $data['data']);
 
// Initialize an array to store the age frequency
$ageFrequency = [];
 
// Loop through each entry to extract the ages
foreach ($entries as $entry) {
    // Split each entry by "=" to get the key-value pair
    list($key, $age) = explode('=', $entry);
 
    // Only process entries where the key starts with "age"
    if (strpos($key, 'age') !== false) {
        $age = trim($age);  // Remove any extra spaces
 
        // Add the age to the frequency array or increment its count
        if (isset($ageFrequency[$age])) {
            $ageFrequency[$age]++;
        } else {
            $ageFrequency[$age] = 1;
        }
    }
}
 
// Sort the ages by ascending order
ksort($ageFrequency);
 
// Prepare the output as an array of objects
$output = [];
foreach ($ageFrequency as $age => $count) {
    $output[] = ['age' => (int)$age, 'count' => $count];
}
 
// Print the result
print_r($output);
?>
 

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