3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(null); var_dump( empty( $a ) ); //bool(false) var_dump( !(bool)$a ); //bool(true) $b = array(false); var_dump( empty( $b ) ); //bool(false) var_dump( !(bool)$b ); //bool(true) $c = array(0); var_dump( empty( $c ) ); //bool(false) var_dump( !(bool)$c ); //bool(false) $d = array(''); var_dump( empty( $d ) ); //bool(false) var_dump( !(bool)$d ); //bool(false) $e = array(); var_dump( empty( $e ) ); //bool(true) var_dump( !(bool)$e ); //bool(false)
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CZiWA
function name:  (null)
number of ops:  51
compiled vars:  !0 = $a, !1 = $b, !2 = $c, !3 = $d, !4 = $e
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_CV                                 ~6      !0
          3        SEND_VAL                                                 ~6
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        BOOL                                             ~8      !0
          7        BOOL_NOT                                         ~9      ~8
          8        SEND_VAL                                                 ~9
          9        DO_ICALL                                                 
    7    10        ASSIGN                                                   !1, <array>
    8    11        INIT_FCALL                                               'var_dump'
         12        ISSET_ISEMPTY_CV                                 ~12     !1
         13        SEND_VAL                                                 ~12
         14        DO_ICALL                                                 
    9    15        INIT_FCALL                                               'var_dump'
         16        BOOL                                             ~14     !1
         17        BOOL_NOT                                         ~15     ~14
         18        SEND_VAL                                                 ~15
         19        DO_ICALL                                                 
   11    20        ASSIGN                                                   !2, <array>
   12    21        INIT_FCALL                                               'var_dump'
         22        ISSET_ISEMPTY_CV                                 ~18     !2
         23        SEND_VAL                                                 ~18
         24        DO_ICALL                                                 
   13    25        INIT_FCALL                                               'var_dump'
         26        BOOL                                             ~20     !2
         27        BOOL_NOT                                         ~21     ~20
         28        SEND_VAL                                                 ~21
         29        DO_ICALL                                                 
   15    30        ASSIGN                                                   !3, <array>
   16    31        INIT_FCALL                                               'var_dump'
         32        ISSET_ISEMPTY_CV                                 ~24     !3
         33        SEND_VAL                                                 ~24
         34        DO_ICALL                                                 
   17    35        INIT_FCALL                                               'var_dump'
         36        BOOL                                             ~26     !3
         37        BOOL_NOT                                         ~27     ~26
         38        SEND_VAL                                                 ~27
         39        DO_ICALL                                                 
   19    40        ASSIGN                                                   !4, <array>
   20    41        INIT_FCALL                                               'var_dump'
         42        ISSET_ISEMPTY_CV                                 ~30     !4
         43        SEND_VAL                                                 ~30
         44        DO_ICALL                                                 
   21    45        INIT_FCALL                                               'var_dump'
         46        BOOL                                             ~32     !4
         47        BOOL_NOT                                         ~33     ~32
         48        SEND_VAL                                                 ~33
         49        DO_ICALL                                                 
         50      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
163.54 ms | 1400 KiB | 15 Q