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<?php $days = array('2'); function alter_days(&$day) { return $day -= 1; } array_filter($days, 'alter_days'); var_dump($days);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/C5EVo
function name:  (null)
number of ops:  9
compiled vars:  !0 = $days
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   11     1        INIT_FCALL                                               'array_filter'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'alter_days'
          4        DO_ICALL                                                 
   13     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Function alter_days:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/C5EVo
function name:  alter_days
number of ops:  4
compiled vars:  !0 = $day
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV                                             !0      
    8     1        ASSIGN_OP                                     2  ~1      !0, 1
          2      > RETURN                                                   ~1
    9     3*     > RETURN                                                   null

End of function alter_days

Generated using Vulcan Logic Dumper, using php 8.0.0


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