- print_r: documentation ( source)
<?php
$data[] = array('title' => 'hello',
'attributes' => array('id' => 4, 'startdate' => '2013-06-11'));
$data[] = array('title' => 'hello second entry',
'attributes' => array('id' => 6, 'startdate' => '2013-04-11'));
print "Inital Data\n";
print_r($data);
print "\n";
print "Sorted Data\n";
print_r($data);
print "\n";