Imports a JSON file as output from the sample_json_export.php script.

sample_json_import.php

<?php
// Only run via SSH
if (PHP_SAPI !== 'cli') exit();
// Instantiate MODX
@include(dirname(__FILE__) . '/config.core.php');
if (!defined('MODX_CORE_PATH')) define('MODX_CORE_PATH', dirname(__FILE__) . '/core/');
include_once (MODX_CORE_PATH . "model/modx/modx.class.php");
$modx= new modX();
$modx->initialize('web');

// If we can't find a Resource matching the import criteria, do we create a new Resource?
$createOnFail = false;
// Import file
$importPath = dirname(__FILE__);
$importFilename = 'export.json';
$import = file_get_contents($importPath . '/' . $importFilename);
if (!$import) {
    echo "Failed to get import file.";
    exit();
}
$import = $modx->fromJSON($import);
if (!is_array($import)) {
    echo "Bad import data";
    exit();
}
// Allowed object classes
$allowed = array(
    'modResource' => 1,
    'modSnippet' => 1,
    'modPlugin' => 1,
    'modChunk' => 1,
    'modTemplate' => 1,
);
// Iterate over classes
foreach ($import as $class => $items) {
    // Check class
    if (!isset($allowed[$class]) || !$allowed[$class] || !is_array($items)) continue;
    // Start counting
    $total = 0;
    $success = 0;
    $fail = 0;
    $skipped = 0;
    // Iterate over class members
    foreach ($items as $item) {
        $total++;
        // required elements
        if (!isset($item['where'], $item['object'])) {
            $skipped++;
            continue;
        }
        // special case for "create" action
        if ($item['where'] === false) {
            // create new object
            $object = $modx->newObject($class);
            if (!$object) {
                $failed++;
                continue;
            }
            // populate with values
            $object->fromArray($item['object']);
            // attempt to save
            // ** BEWARE of collisions on unique fields **
            if ($object->save()) {
                $success++;
            } else {
                $fail++;
            }
            
        } elseif (is_array($item['where'])) {
            // fetch existing object
            // hopefully you double-checked your query criteria to ensure you found the correct object!
            $object = $modx->getObject($class, $item['where']);
            // if we didn't find it, we either create a new one or skip this one
            if (!$object) {
                if (!$createOnFail) {
                   $failed++;
                   continue; 
                } else {
                    $object = $modx->newObject($class);
                    if (!$object) {
                        $failed++;
                        continue;
                    }
                }   
            }
            // populate with values
            $object->fromArray($item['object']);
            // attempt to save
            if ($object->save()) {
                $success++;
            } else {
                $fail++;
            }
            
        } else {
            $skipped++;
            continue;
        }    
    }
    // primitive reporting
    echo $success . ' succeeded, ' . $fail . ' failed, and ' . $skipped . ' skipped out of total ' . $total . ' ' . $class . '<br>' . PHP_EOL;
}