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<?php echo strtotime('Y-m-d 23:59:59'); echo date('d-m-Y H:i:s',strtotime(' - 3 day', strtotime('Y-m-d 23:59:59')));
based on hmpJe
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/N1omp
function name:  (null)
number of ops:  17
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'strtotime'
         1        SEND_VAL                                                 'Y-m-d+23%3A59%3A59'
         2        DO_ICALL                                         $0      
         3        ASSIGN_OBJ                                               $0
   3     4        INIT_FCALL                                               'date'
         5        SEND_VAL                                                 'd-m-Y+H%3Ai%3As'
         6        INIT_FCALL                                               'strtotime'
         7        SEND_VAL                                                 '+-+3+day'
         8        INIT_FCALL                                               'strtotime'
         9        SEND_VAL                                                 'Y-m-d+23%3A59%3A59'
        10        DO_ICALL                                         $1      
        11        SEND_VAR                                                 $1
        12        DO_ICALL                                         $2      
        13        SEND_VAR                                                 $2
        14        DO_ICALL                                         $3      
        15        ASSIGN_OBJ                                               $3
        16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0