Modx $_SESSION

<?php
$output = $modx->runSnippet('pdoResources',array(
   'includeTVs' => 'place_banner',
   'parents' => '3',
   'depth' => '2',
   'limit' => '0',
   'sortby' => 'RAND()',
   'returnIds' => '1',
   'where' => '{"template:=":"5", "place_banner:!=":""}'
));
$outputArray = explode(',', $output);
echo("<script>console.log('IN SES: " . $_SESSION['current_adimg'] . "');</script>");
echo("<script>console.log('IN ARR: " . $outputArray[0] . "');</script>");
if ( empty( $_SESSION['current_adimg'] ) ) {
	$_SESSION['current_adimg'] = $outputArray[0];
	echo("<script>console.log('ON EMPTY SES: " . $_SESSION['current_adimg'] . "');</script>");
	$modx->setPlaceholder($toPlaceholder,  $_SESSION['current_adimg']);
	return;
}
else if ($_SESSION['current_adimg'] == $outputArray[0]) {
	$_SESSION['current_adimg'] = $outputArray[1];
	echo("<script>console.log('ON REP SES: " . $_SESSION['current_adimg'] . "');</script>");
	$modx->setPlaceholder($toPlaceholder,  $_SESSION['current_adimg']);
	return;
}
else {
	$_SESSION['current_adimg'] = $outputArray[0];
	echo("<script>console.log('JUST SES: " . $_SESSION['current_adimg'] . "');</script>");
	$modx->setPlaceholder($toPlaceholder,  $_SESSION['current_adimg']);
	return;
}