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<?php $arg = '4'; $func = 'is_numeric'; $res = $func($arg); var_dump($res);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gQ3oi
function name:  (null)
number of ops:  10
compiled vars:  !0 = $arg, !1 = $func, !2 = $res
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '4'
    3     1        ASSIGN                                                   !1, 'is_numeric'
    5     2        INIT_DYNAMIC_CALL                                        !1
          3        SEND_VAR_EX                                              !0
          4        DO_FCALL                                      0  $5      
          5        ASSIGN                                                   !2, $5
    7     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !2
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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