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<?php echo date('d-m-Y H:i:s', strtotime('-3 day'));
based on Eg3q6
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FCZPI
function name:  (null)
number of ops:  9
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'date'
         1        SEND_VAL                                                 'd-m-Y+H%3Ai%3As'
         2        INIT_FCALL                                               'strtotime'
         3        SEND_VAL                                                 '-3+day'
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                         $1      
         7        ASSIGN_OBJ                                               $1
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0