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<?php $arr = array(0,null,3,null); print_r(array_filter($arr), function($var){ return $var !== null; });
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GYjoo
function name:  (null)
number of ops:  10
compiled vars:  !0 = $arr
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        INIT_FCALL                                               'print_r'
         2        INIT_FCALL                                               'array_filter'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $2      
         5        SEND_VAR                                                 $2
         6        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FGYjoo0x7ff243cac066'
         7        SEND_VAL                                                 ~3
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FGYjoo0x7ff243cac066:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GYjoo
function name:  {closure}
number of ops:  4
compiled vars:  !0 = $var
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
         0  E >   RECV                                             !0      
         1        IS_NOT_IDENTICAL                                 ~1      !0, null
         2      > RETURN                                                   ~1
         3*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FGYjoo0x7ff243cac066

Generated using Vulcan Logic Dumper, using php 7.3.0