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<?php var_dump(strtotime('1987-05-30') * 1000); var_dump(date('Y-m-d', 549255600000));
based on E2q2N
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CBcMV
function name:  (null)
number of ops:  15
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'strtotime'
         2        SEND_VAL                                                 '1987-05-30'
         3        DO_ICALL                                         $0      
         4        MUL                                              ~1      $0, 1000
         5        SEND_VAL                                                 ~1
         6        DO_ICALL                                                 
   5     7        INIT_FCALL                                               'var_dump'
         8        INIT_FCALL                                               'date'
         9        SEND_VAL                                                 'Y-m-d'
        10        SEND_VAL                                                 549255600000
        11        DO_ICALL                                         $3      
        12        SEND_VAR                                                 $3
        13        DO_ICALL                                                 
        14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0