3v4l.org

run code in 300+ PHP versions simultaneously
<?php function isQuadtree($bits, &$i = -1){ $i++; if ($i > strlen($bits)) return false; if ($bits[$i] === "1") { isQuadtree($bits, $i); isQuadtree($bits, $i); isQuadtree($bits, $i); return isQuadtree($bits, $i); } return true; } var_dump(isQuadtree("110000"));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ej0Yc
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'isquadtree'
          2        SEND_VAL                                                 '110000'
          3        DO_FCALL                                      0  $0      
          4        SEND_VAR                                                 $0
          5        DO_ICALL                                                 
          6      > RETURN                                                   1

Function isquadtree:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 7
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 7
2 jumps found. (Code = 43) Position 1 = 10, Position 2 = 27
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 27
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ej0Yc
function name:  isQuadtree
number of ops:  29
compiled vars:  !0 = $bits, !1 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV_INIT                                        !1      -1
    4     2        PRE_INC                                                  !1
    5     3        STRLEN                                           ~3      !0
          4        IS_SMALLER                                               ~3, !1
          5      > JMPZ                                                     ~4, ->7
          6    > > RETURN                                                   <false>
    6     7    >   FETCH_DIM_R                                      ~5      !0, !1
          8        IS_IDENTICAL                                             ~5, '1'
          9      > JMPZ                                                     ~6, ->27
    7    10    >   INIT_FCALL_BY_NAME                                       'isQuadtree'
         11        SEND_VAR_EX                                              !0
         12        SEND_VAR_EX                                              !1
         13        DO_FCALL                                      0          
    8    14        INIT_FCALL_BY_NAME                                       'isQuadtree'
         15        SEND_VAR_EX                                              !0
         16        SEND_VAR_EX                                              !1
         17        DO_FCALL                                      0          
    9    18        INIT_FCALL_BY_NAME                                       'isQuadtree'
         19        SEND_VAR_EX                                              !0
         20        SEND_VAR_EX                                              !1
         21        DO_FCALL                                      0          
   10    22        INIT_FCALL_BY_NAME                                       'isQuadtree'
         23        SEND_VAR_EX                                              !0
         24        SEND_VAR_EX                                              !1
         25        DO_FCALL                                      0  $10     
         26      > RETURN                                                   $10
   12    27    > > RETURN                                                   <true>
   13    28*     > RETURN                                                   null

End of function isquadtree

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
148.47 ms | 1013 KiB | 15 Q