Size of Json Object (In Kbs/Mbs)

How to get the size of a file in MB (Megabytes)?

Use the length() method of the File class to return the size of the file in bytes.

// Get file from file name
File file = new File("U:\intranet_root\intranet\R1112B2.zip");

// Get length of file in bytes
long fileSizeInBytes = file.length();
// Convert the bytes to Kilobytes (1 KB = 1024 Bytes)
long fileSizeInKB = fileSizeInBytes / 1024;
// Convert the KB to MegaBytes (1 MB = 1024 KBytes)
long fileSizeInMB = fileSizeInKB / 1024;

if (fileSizeInMB > 27) {
  ...
}

You could combine the conversion into one step, but I've tried to fully illustrate the process.

Format bytes to kilobytes, megabytes, gigabytes

function formatBytes($bytes, $precision = 2) { 
    $units = array('B', 'KB', 'MB', 'GB', 'TB'); 

    $bytes = max($bytes, 0); 
    $pow = floor(($bytes ? log($bytes) : 0) / log(1024)); 
    $pow = min($pow, count($units) - 1); 

    // Uncomment one of the following alternatives
    // $bytes /= pow(1024, $pow);
    // $bytes /= (1 << (10 * $pow)); 

    return round($bytes, $precision) . ' ' . $units[$pow]; 
} 

(Taken from php.net, there are many other examples there, but I like this one best :-)

How do I implode a json object to a string in php?

$json_object = '[{"125":"1"},{"126":"2"},{"127":"3"},{"128":"4"},{"129":"5"},{"130":"6"},{"131":"7"},{"132":"8"},{"133":"9"},{"134":"10"},{"135":"11"}]';

$json = json_decode($json_object);
echo implode(", ", array_map(function($obj) { foreach ($obj as $p => $v) { return $p;} }, $json));
echo "<br>";
echo implode(", ", array_map(function($obj) { foreach ($obj as $p => $v) { return $v;} }, $json));

See https://3v4l.org/p3p45

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