Batch Boilerplate

<?php
 
function my_batch_name(){
	$chunk_size = 120; // Items per run to process
 
	// Get the data array
	$data = get_data();
 
	// Batch init
	$batch = array(
		'title' => t('My title ...'), // Change to the batch title
		'operations' => array(),
		'init_message' => t('Commencing'),
		'progress_message' => t('Processed @current out of @total.'),
		//'file' => drupal_get_path('module', 'mymodule') . '/includes/my_batch_name.inc',
		'error_message' => t('An error occurred during processing'),
		'finished' => 'batch_finished',
		'progressive' => FALSE
	);
 
	if ($data){
		$chunks = array_chunk($data, $chunk_size);
		$count_chunks = count($chunks);
 
		$i = 1 ;
		foreach($chunks as $chunk){
			$batch['operations'][] = array('process_chunk', array($chunk, 'details' => t('(Importing chunk @chunk of @count)', array('@chunk '=> $i, '@count'=> $count_chunks))));
			//if ($i == 1) break; // Debugging purposes - Break on the first run.
			$i++;
		}
	}
	batch_set($batch);
	batch_process('<front>'); //Change to the desired batch finish page.
}
 
function get_data(){
	$query = new EntityFieldQuery();
	// do the query / get the data
 
        $results = $query->execute();
        if (isset($results['node'])){
    	    return array_keys($results['node']);
        }
        return array();
}
 
// Batch operation: Process chunks.
function process_chunk($data_chunk, $operation_details, &$context){
	foreach($data_chunk as $data){
	  // Do the processing
	  // $node = node_load($data);
	  // node_save($node);
	}
$context['message'] = $operation_details; //Will show what chunk we're on.
}
 
function batch_finished($success, $results, $operations){
	if ($success) {
		$message = 'Success.'; // Customize success message.
	}
	else {
		$message = 'There were errors in the operations. Could not complete the process';
	}
	drupal_set_message($message);
}