3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $record = new stdclass; $record->working = 1; $record->intervals[] = array(1,2,3,4); $records[0] = $record; $row = serialize($records); echo $row;
based on j2gPY
Output for 4.3.0 - 7.1.0
a:1:{i:0;O:8:"stdClass":2:{s:7:"working";i:1;s:9:"intervals";a:1:{i:0;a:4:{i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;}}}}