PHP EXT_STMT opcode training.

ext_stmt.txt

1. input -> empty file

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E > > RETURN                                                   1

2. input -> '<?php'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E > > RETURN                                                   1

3. input -> '<?php ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   EXT_STMT                                                 
         1      > RETURN                                                   1

4. input -> '<?php $test = null; ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   EXT_STMT                                                 
         1        ASSIGN                                                   !0, null
   2     2        EXT_STMT                                                 
         3      > RETURN                                                   1

5. input -> '<?php foreach([1, 2, 3] as $it) $test = null; ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   EXT_STMT                                                 
         1        INIT_ARRAY                                       ~0      1
         2        ADD_ARRAY_ELEMENT                                ~0      2
         3        ADD_ARRAY_ELEMENT                                ~0      3
         4      > FE_RESET                                         $1      ~0, ->10
         5    > > FE_FETCH                                         $2      $1, ->10
         6    >   OP_DATA                                                  
         7        ASSIGN                                                   !0, $2
         8        ASSIGN                                                   !1, null
         9      > JMP                                                      ->5
        10    >   SWITCH_FREE                                              $1
   2    11        EXT_STMT                                                 
        12      > RETURN                                                   1

6. input -> '<?php foreach([1, 2, 3] as $it) { $test = null; }  $test2 = true; ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   EXT_STMT                                                 
         1        INIT_ARRAY                                       ~0      1
         2        ADD_ARRAY_ELEMENT                                ~0      2
         3        ADD_ARRAY_ELEMENT                                ~0      3
         4      > FE_RESET                                         $1      ~0, ->11
         5    > > FE_FETCH                                         $2      $1, ->11
         6    >   OP_DATA                                                  
         7        ASSIGN                                                   !0, $2
         8        EXT_STMT                                                 
         9        ASSIGN                                                   !1, null
        10      > JMP                                                      ->5
        11    >   SWITCH_FREE                                              $1
        12        EXT_STMT                                                 
        13        ASSIGN                                                   !2, <bool>
   2    14        EXT_STMT                                                 
        15      > RETURN                                                   1

7. input -> '<?php foreach([1, 2, 3] as $it) { $test = null; }  $test2 = true; function a() {} ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   EXT_STMT                                                 
         1        INIT_ARRAY                                       ~0      1
         2        ADD_ARRAY_ELEMENT                                ~0      2
         3        ADD_ARRAY_ELEMENT                                ~0      3
         4      > FE_RESET                                         $1      ~0, ->11
         5    > > FE_FETCH                                         $2      $1, ->11
         6    >   OP_DATA                                                  
         7        ASSIGN                                                   !0, $2
         8        EXT_STMT                                                 
         9        ASSIGN                                                   !1, null
        10      > JMP                                                      ->5
        11    >   SWITCH_FREE                                              $1
        12        EXT_STMT                                                 
        13        ASSIGN                                                   !2, <bool>
        14        EXT_STMT                                                 
        15        NOP                                                      
   2    16        EXT_STMT                                                 
        17      > RETURN                                                   1

8. input -> '<?php foreach([1, 2, 3] as $it) { $test = null; }  $test2 = true; class b { function a() {} } ?>'

line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   EXT_STMT                                                 
         1        INIT_ARRAY                                       ~0      1
         2        ADD_ARRAY_ELEMENT                                ~0      2
         3        ADD_ARRAY_ELEMENT                                ~0      3
         4      > FE_RESET                                         $1      ~0, ->11
         5    > > FE_FETCH                                         $2      $1, ->11
         6    >   OP_DATA                                                  
         7        ASSIGN                                                   !0, $2
         8        EXT_STMT                                                 
         9        ASSIGN                                                   !1, null
        10      > JMP                                                      ->5
        11    >   SWITCH_FREE                                              $1
        12        EXT_STMT                                                 
        13        ASSIGN                                                   !2, <bool>
        14        EXT_STMT                                                 
        15        NOP                                                      
   2    16        EXT_STMT                                                 
        17      > RETURN                                                   1