Create a php script to generate a json file

Please read carefully the information and also make your proposal with real amoutn. Thank you.

I need to create a json file from a php script. The structure of the json file is available in the json schema I have attached to this project.

At the moment I dont have real data, so information has to pass thru php variables with dummy data. As example:
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<?php
$variable1=1;
$variable2=2;

$response = array();
$posts = array();
$posts[] = array('variable1'=> $variable1, 'variable2'=> $variable2);
$response['posts'] = $posts;
$fp = fopen('results.json', 'w');
fwrite($fp, json_encode($response));
fclose($fp);
?>
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All variables and objecst has to be in the script. You can give this information from json schema wich has made with Altova.