Pt.3: DataTables ColReorder Ajax State Save

<?php
// state_load.php
header('Content-Type: application/json');
try {
    $fh = fopen('saved_state.json', 'r');
    $content = fread($fh, 10000);
    fclose($fh);
    $arr = json_decode($content);
    $ret = array('ColReorder'=>$arr->ColReorder);
    echo json_encode($ret);
} catch (Exception $e) {
    echo "Error";
}