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<?php function which_is_lower($a, $b) { if ( $a < $b ) { return $a; } else { return $b; } } function compare_comparisons($a, $b) { echo 'min() gives: '; var_dump( min($a, $b) ); echo 'comparison with < gives: '; var_dump( which_is_lower($a, $b) ); } echo "\n", '-1 vs NULL: ', "\n"; compare_comparisons(-1, NULL); echo "\n", '1 vs NULL: ', "\n"; compare_comparisons(1, NULL); echo "\n", '-1 vs FALSE: ', "\n"; compare_comparisons(-1, FALSE); echo "\n", '1 vs FALSE: ', "\n"; compare_comparisons(1, FALSE); echo "\n", '-1 vs TRUE: ', "\n"; compare_comparisons(-1, FALSE); echo "\n", '1 vs TRUE: ', "\n"; compare_comparisons(1, FALSE);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oqqEs
function name:  (null)
number of ops:  43
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   23     0  E >   ECHO                                                     '%0A'
          1        ECHO                                                     '-1+vs+NULL%3A+'
          2        ECHO                                                     '%0A'
   24     3        INIT_FCALL                                               'compare_comparisons'
          4        SEND_VAL                                                 -1
          5        SEND_VAL                                                 null
          6        DO_FCALL                                      0          
   26     7        ECHO                                                     '%0A'
          8        ECHO                                                     '1+vs+NULL%3A+'
          9        ECHO                                                     '%0A'
   27    10        INIT_FCALL                                               'compare_comparisons'
         11        SEND_VAL                                                 1
         12        SEND_VAL                                                 null
         13        DO_FCALL                                      0          
   29    14        ECHO                                                     '%0A'
         15        ECHO                                                     '-1+vs+FALSE%3A+'
         16        ECHO                                                     '%0A'
   30    17        INIT_FCALL                                               'compare_comparisons'
         18        SEND_VAL                                                 -1
         19        SEND_VAL                                                 <false>
         20        DO_FCALL                                      0          
   32    21        ECHO                                                     '%0A'
         22        ECHO                                                     '1+vs+FALSE%3A+'
         23        ECHO                                                     '%0A'
   33    24        INIT_FCALL                                               'compare_comparisons'
         25        SEND_VAL                                                 1
         26        SEND_VAL                                                 <false>
         27        DO_FCALL                                      0          
   35    28        ECHO                                                     '%0A'
         29        ECHO                                                     '-1+vs+TRUE%3A+'
         30        ECHO                                                     '%0A'
   36    31        INIT_FCALL                                               'compare_comparisons'
         32        SEND_VAL                                                 -1
         33        SEND_VAL                                                 <false>
         34        DO_FCALL                                      0          
   38    35        ECHO                                                     '%0A'
         36        ECHO                                                     '1+vs+TRUE%3A+'
         37        ECHO                                                     '%0A'
   39    38        INIT_FCALL                                               'compare_comparisons'
         39        SEND_VAL                                                 1
         40        SEND_VAL                                                 <false>
         41        DO_FCALL                                      0          
         42      > RETURN                                                   1

Function which_is_lower:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 6
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oqqEs
function name:  which_is_lower
number of ops:  8
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    5     2        IS_SMALLER                                               !0, !1
          3      > JMPZ                                                     ~2, ->6
    7     4    > > RETURN                                                   !0
          5*       JMP                                                      ->7
   11     6    > > RETURN                                                   !1
   13     7*     > RETURN                                                   null

End of function which_is_lower

Function compare_comparisons:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oqqEs
function name:  compare_comparisons
number of ops:  19
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   17     2        ECHO                                                     'min%28%29+gives%3A+'
   18     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'min'
          5        SEND_VAR                                                 !0
          6        SEND_VAR                                                 !1
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                                 
   19    10        ECHO                                                     'comparison+with+%3C+gives%3A+'
   20    11        INIT_FCALL                                               'var_dump'
         12        INIT_FCALL                                               'which_is_lower'
         13        SEND_VAR                                                 !0
         14        SEND_VAR                                                 !1
         15        DO_FCALL                                      0  $4      
         16        SEND_VAR                                                 $4
         17        DO_ICALL                                                 
   21    18      > RETURN                                                   null

End of function compare_comparisons

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