3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bool = false; echo 'is ', var_export($bool, true), ' empty? ', var_export(empty($bool)), "\n"; $str = (string)$bool; echo 'is ', var_export($str, true), ' empty? ', var_export(empty($str)), "\n"; $bool = (bool)$str; echo 'is ', var_export($bool, true), ' empty? ', var_export(empty($bool)), "\n";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LWEYB
function name:  (null)
number of ops:  45
compiled vars:  !0 = $bool, !1 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <false>
    3     1        ECHO                                                     'is+'
          2        INIT_FCALL                                               'var_export'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 <true>
          5        DO_ICALL                                         $3      
          6        ECHO                                                     $3
          7        ECHO                                                     '+empty%3F+'
          8        INIT_FCALL                                               'var_export'
          9        ISSET_ISEMPTY_CV                                 ~4      !0
         10        SEND_VAL                                                 ~4
         11        DO_ICALL                                         $5      
         12        ECHO                                                     $5
         13        ECHO                                                     '%0A'
    5    14        CAST                                          6  ~6      !0
         15        ASSIGN                                                   !1, ~6
    6    16        ECHO                                                     'is+'
         17        INIT_FCALL                                               'var_export'
         18        SEND_VAR                                                 !1
         19        SEND_VAL                                                 <true>
         20        DO_ICALL                                         $8      
         21        ECHO                                                     $8
         22        ECHO                                                     '+empty%3F+'
         23        INIT_FCALL                                               'var_export'
         24        ISSET_ISEMPTY_CV                                 ~9      !1
         25        SEND_VAL                                                 ~9
         26        DO_ICALL                                         $10     
         27        ECHO                                                     $10
         28        ECHO                                                     '%0A'
    8    29        BOOL                                             ~11     !1
         30        ASSIGN                                                   !0, ~11
    9    31        ECHO                                                     'is+'
         32        INIT_FCALL                                               'var_export'
         33        SEND_VAR                                                 !0
         34        SEND_VAL                                                 <true>
         35        DO_ICALL                                         $13     
         36        ECHO                                                     $13
         37        ECHO                                                     '+empty%3F+'
         38        INIT_FCALL                                               'var_export'
         39        ISSET_ISEMPTY_CV                                 ~14     !0
         40        SEND_VAL                                                 ~14
         41        DO_ICALL                                         $15     
         42        ECHO                                                     $15
         43        ECHO                                                     '%0A'
         44      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
161.46 ms | 1396 KiB | 15 Q