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<?php $var = null; $var = new stdClass(); $time1 = microtime(true); for ($i = 0; $i <= 1000000; $i++) { if (!$var) {} } $time1 = microtime(true) - $time1; echo "Time using '!': $time1\n"; $time2 = microtime(true); for ($i = 0; $i <= 1000000; $i++) { if ($var === null) {} } $time2 = microtime(true) - $time2; echo "Time using '===': $time2\n"; if ($time1 > $time2) echo '"===" was faster'; else echo '"!" was faster';
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 13
Branch analysis from position: 13
2 jumps found. (Code = 44) Position 1 = 15, Position 2 = 10
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 33
Branch analysis from position: 33
2 jumps found. (Code = 44) Position 1 = 35, Position 2 = 30
Branch analysis from position: 35
2 jumps found. (Code = 43) Position 1 = 46, Position 2 = 48
Branch analysis from position: 46
1 jumps found. (Code = 42) Position 1 = 49
Branch analysis from position: 49
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 48
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 30
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 32
Branch analysis from position: 32
2 jumps found. (Code = 44) Position 1 = 35, Position 2 = 30
Branch analysis from position: 35
Branch analysis from position: 30
Branch analysis from position: 32
Branch analysis from position: 10
2 jumps found. (Code = 43) Position 1 = 12, Position 2 = 12
Branch analysis from position: 12
2 jumps found. (Code = 44) Position 1 = 15, Position 2 = 10
Branch analysis from position: 15
Branch analysis from position: 10
Branch analysis from position: 12
filename:       /in/97CC5
function name:  (null)
number of ops:  50
compiled vars:  !0 = $var, !1 = $time1, !2 = $i, !3 = $time2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        NEW                                              $5      'stdClass'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $5
    6     4        INIT_FCALL                                               'microtime'
          5        SEND_VAL                                                 <true>
          6        DO_ICALL                                         $8      
          7        ASSIGN                                                   !1, $8
    8     8        ASSIGN                                                   !2, 0
          9      > JMP                                                      ->13
    9    10    >   BOOL_NOT                                         ~11     !0
         11      > JMPZ                                                     ~11, ->12
    8    12    >   PRE_INC                                                  !2
         13    >   IS_SMALLER_OR_EQUAL                                      !2, 1000000
         14      > JMPNZ                                                    ~13, ->10
   12    15    >   INIT_FCALL                                               'microtime'
         16        SEND_VAL                                                 <true>
         17        DO_ICALL                                         $14     
         18        SUB                                              ~15     $14, !1
         19        ASSIGN                                                   !1, ~15
   14    20        ROPE_INIT                                     3  ~18     'Time+using+%27%21%27%3A+'
         21        ROPE_ADD                                      1  ~18     ~18, !1
         22        ROPE_END                                      2  ~17     ~18, '%0A'
         23        ECHO                                                     ~17
   17    24        INIT_FCALL                                               'microtime'
         25        SEND_VAL                                                 <true>
         26        DO_ICALL                                         $20     
         27        ASSIGN                                                   !3, $20
   19    28        ASSIGN                                                   !2, 0
         29      > JMP                                                      ->33
   20    30    >   TYPE_CHECK                                    2          !0
         31      > JMPZ                                                     ~23, ->32
   19    32    >   PRE_INC                                                  !2
         33    >   IS_SMALLER_OR_EQUAL                                      !2, 1000000
         34      > JMPNZ                                                    ~25, ->30
   23    35    >   INIT_FCALL                                               'microtime'
         36        SEND_VAL                                                 <true>
         37        DO_ICALL                                         $26     
         38        SUB                                              ~27     $26, !3
         39        ASSIGN                                                   !3, ~27
   25    40        ROPE_INIT                                     3  ~30     'Time+using+%27%3D%3D%3D%27%3A+'
         41        ROPE_ADD                                      1  ~30     ~30, !3
         42        ROPE_END                                      2  ~29     ~30, '%0A'
         43        ECHO                                                     ~29
   27    44        IS_SMALLER                                               !3, !1
         45      > JMPZ                                                     ~32, ->48
   28    46    >   ECHO                                                     '%22%3D%3D%3D%22+was+faster'
         47      > JMP                                                      ->49
   30    48    >   ECHO                                                     '%22%21%22+was+faster'
         49    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
149.22 ms | 1400 KiB | 15 Q