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<?php var_dump((new DateTime('@123'))->format('U') === '123'); var_dump((new DateTimeImmutable('@123'))->format('U') === '123'); var_dump((new DateTime('@123.456789'))->format('U.u') === '123.456789'); var_dump((new DateTimeImmutable('@123.456789'))->format('U.u') === '123.456789');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tG4fN
function name:  (null)
number of ops:  41
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        NEW                                              $0      'DateTime'
          2        SEND_VAL_EX                                              '%40123'
          3        DO_FCALL                                      0          
          4        INIT_METHOD_CALL                                         $0, 'format'
          5        SEND_VAL_EX                                              'U'
          6        DO_FCALL                                      0  $2      
          7        IS_IDENTICAL                                     ~3      $2, '123'
          8        SEND_VAL                                                 ~3
          9        DO_ICALL                                                 
    4    10        INIT_FCALL                                               'var_dump'
         11        NEW                                              $5      'DateTimeImmutable'
         12        SEND_VAL_EX                                              '%40123'
         13        DO_FCALL                                      0          
         14        INIT_METHOD_CALL                                         $5, 'format'
         15        SEND_VAL_EX                                              'U'
         16        DO_FCALL                                      0  $7      
         17        IS_IDENTICAL                                     ~8      $7, '123'
         18        SEND_VAL                                                 ~8
         19        DO_ICALL                                                 
    6    20        INIT_FCALL                                               'var_dump'
         21        NEW                                              $10     'DateTime'
         22        SEND_VAL_EX                                              '%40123.456789'
         23        DO_FCALL                                      0          
         24        INIT_METHOD_CALL                                         $10, 'format'
         25        SEND_VAL_EX                                              'U.u'
         26        DO_FCALL                                      0  $12     
         27        IS_IDENTICAL                                     ~13     $12, '123.456789'
         28        SEND_VAL                                                 ~13
         29        DO_ICALL                                                 
    7    30        INIT_FCALL                                               'var_dump'
         31        NEW                                              $15     'DateTimeImmutable'
         32        SEND_VAL_EX                                              '%40123.456789'
         33        DO_FCALL                                      0          
         34        INIT_METHOD_CALL                                         $15, 'format'
         35        SEND_VAL_EX                                              'U.u'
         36        DO_FCALL                                      0  $17     
         37        IS_IDENTICAL                                     ~18     $17, '123.456789'
         38        SEND_VAL                                                 ~18
         39        DO_ICALL                                                 
         40      > RETURN                                                   1

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