arraymerge.php

<?php

$data = array();

$data = array(
    'channel' => 1,
    'data' => array (
        array(
            'identity' => array('email' => 'email'),
            'events' => array(
                array('verb' => 'contact', 'data' => array('first-name' => 'my', 'last-name' => 'name', 'occupation' => 'yet another value')),
                array('verb' => 'order',   'data' => array('item-name' => 'name of the item', 'price' => 100.0))
            )
        )
    )
);

$temp = array(
		 array('verb' => 'order',   'data' => array('item-name' => 'name of the item 1', 'price' => 110.0)),
		 array('verb' => 'order',   'data' => array('item-name' => 'name of the item 2', 'price' => 120.0))
);
foreach ($temp as $item) {
	# code...
	$data['data'][0]['events'][] = $item;
}

print_r($data['data'][0]['events']);

$data['data'][0]['events'] += $temp;