Document Creation Plugin Help

if ( $modx->documentIdentifier == 189 ) {
$wuid = '-'.$_SESSION['webInternalKey'];
	$table_name_docs = $modx->getFullTableName( 'site_content' );
     	$fields = array(
                         'type'	=>  'document',
			'contentType'	=> 'text/html',
			'content'	=> 'data',
			'pagetitle' => 'data',
			'alias'	=> 'data',
			'longtitle'	=> 'data',
			'description'	=> 'data',
			'published'	=> '1', 
 			'parent'	=> '375', 
			'isfolder'	=> '1', 
			'template'	=> '0',
			'cacheable'	=> '0',
			'createdby'	=> $wuid,
			'createdon'	=> time(),
			'editedon'	=> time(),
			'publishedon'	=> time(),
			'hidemenu'	=> '0',
           		'privateweb'	=> '0'

			);

	$modx->db->insert( $fields, $table_name_docs);

    $modx->db->connect();
    include_once "manager/processors/cache_sync.class.processor.php";
    $sync = new synccache();
    $sync->setCachepath("assets/cache/");
    $sync->setReport(true);
    $sync->emptyCache();

   return;
}

<h3>ADD MY LOCATION</h3>
<div style="text-align:left;">
<form  action="/[~[*id*]~]" method="post" >
<button type="submit" >CREATE MY PAGE</button>
</form>
</div>

// initialize and get the number of children for a particular parent
$childCount = 0;
if ($children = $modx->getChildIds($parent, $depth)) {
    $childCount = count($children);
}
// do something with $childCount or just return it
return $childCount;

<?php
// Set $parentDocId to something sensible above
// Set $userId to something sensible above
$children = $modx->getAllChildren($parentDocId, 'menuindex', 'ASC', 'id, createdby');
foreach ($children as $child) {
  if ($child['createdby'] == $userId) {
    return "Found a match";
  }
}
return "No match found";