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<?php var_dump(is_string(''), is_string(' ')); # true true $v = ''; $v[] = 1; var_dump($v);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/c0Iq4
function name:  (null)
number of ops:  13
compiled vars:  !0 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        TYPE_CHECK                                   64  ~1      ''
          2        SEND_VAL                                                 ~1
          3        TYPE_CHECK                                   64  ~2      '+'
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
    5     6        ASSIGN                                                   !0, ''
    6     7        ASSIGN_DIM                                               !0
          8        OP_DATA                                                  1
    8     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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