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<?php $array = unserialize('a:2:{s:9:"messageId";s:9:"244674923";s:11:"reservation";a:7:{s:7:"agentId";s:3:"569";s:13:"reservationId";i:288565;s:9:"startTime";s:25:"2015-03-23T09:15:00+00:00";s:7:"endTime";s:25:"2015-03-23T10:30:00+00:00";s:4:"rfid";s:16:"00000000A614D673";s:15:"bookingPosition";i:1;s:19:"useSMSBackupChannel";b:0;}}'); $test = new ArrayObject($array); var_dump(serialize($test));
based on Fg9tI
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/N25gV
function name:  (null)
number of ops:  15
compiled vars:  !0 = $array, !1 = $test
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'unserialize'
         1        SEND_VAL                                                 'a%3A2%3A%7Bs%3A9%3A%22messageId%22%3Bs%3A9%3A%22244674923%22%3Bs%3A11%3A%22reservation%22%3Ba%3A7%3A%7Bs%3A7%3A%22agentId%22%3Bs%3A3%3A%22569%22%3Bs%3A13%3A%22reservationId%22%3Bi%3A288565%3Bs%3A9%3A%22startTime%22%3Bs%3A25%3A%222015-03-23T09%3A15%3A00%2B00%3A00%22%3Bs%3A7%3A%22endTime%22%3Bs%3A25%3A%222015-03-23T10%3A30%3A00%2B00%3A00%22%3Bs%3A4%3A%22rfid%22%3Bs%3A16%3A%2200000000A614D673%22%3Bs%3A15%3A%22bookingPosition%22%3Bi%3A1%3Bs%3A19%3A%22useSMSBackupChannel%22%3Bb%3A0%3B%7D%7D'
         2        DO_ICALL                                         $2      
         3        ASSIGN                                                   !0, $2
   5     4        NEW                                              $4      :-4
         5        SEND_VAR_EX                                              !0
         6        DO_FCALL                                      0          
         7        ASSIGN                                                   !1, $4
   7     8        INIT_FCALL                                               'var_dump'
         9        INIT_FCALL                                               'serialize'
        10        SEND_VAR                                                 !1
        11        DO_ICALL                                         $7      
        12        SEND_VAR                                                 $7
        13        DO_ICALL                                                 
        14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0