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<?php $var = 'test'; $test = '234'; var_dump(is_numeric(${$var}[0]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u6ihh
function name:  (null)
number of ops:  11
compiled vars:  !0 = $var, !1 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'test'
    3     1        ASSIGN                                                   !1, '234'
    4     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'is_numeric'
          4        FETCH_R                      local               ~4      !0
          5        FETCH_DIM_R                                      ~5      ~4, 0
          6        SEND_VAL                                                 ~5
          7        DO_ICALL                                         $6      
          8        SEND_VAR                                                 $6
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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