Convert JSON files each to CSV.

json2csv.php

<?php
$AS_ARRAY = true;

$files = glob('*.json');

foreach($files as $fname) {
	echo $fname . PHP_EOL;
	$json_data = file_get_contents($fname);
	$json_obj = json_decode($json_data, $AS_ARRAY);
	$fp = fopen(basename($fname, '.json') . '.csv', 'w');

	$hdr = true;
	foreach($json_obj as $fields) {
		if($hdr) fputcsv($fp, array_keys($fields));
		$hdr = false;
		fputcsv($fp, $fields);
	}

	fclose($fp);
}