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<?php echo date('d-m-Y 23:59:59', strtotime('-3 day', strtotime("d-m-Y 23:59:59")));
based on hhiCG
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/W4bk1
function name:  (null)
number of ops:  13
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'date'
         1        SEND_VAL                                                 'd-m-Y+23%3A59%3A59'
         2        INIT_FCALL                                               'strtotime'
         3        SEND_VAL                                                 '-3+day'
         4        INIT_FCALL                                               'strtotime'
         5        SEND_VAL                                                 'd-m-Y+23%3A59%3A59'
         6        DO_ICALL                                         $0      
         7        SEND_VAR                                                 $0
         8        DO_ICALL                                         $1      
         9        SEND_VAR                                                 $1
        10        DO_ICALL                                         $2      
        11        ASSIGN_OBJ                                               $2
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0