<?php
|dd0000|$i = 10;|
do {
    |0000dd|echo $i;|
} while ( |00dd00|--$i| );
compiled vars:  !0 = $i
line     #* E I O op                           fetch  return  operands
   2     0  E >   EXT_STMT                                    
         1        |dd0000|ASSIGN                                      !0, 10|
   3     2        NOP                                         
   4     3    >   EXT_STMT                                    
         4        |0000dd|ECHO                                        !0|
   5     5        |00dd00|PRE_DEC                             $2      !0|
         6      > |00dd00|JMPNZ                                       $2, ->3|
         7    > > RETURN                                      1