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<?php $dow = 0; $weekday = (new DateTime('Sunday')) ->add(new DateInterval('P' . $dow . 'D')); echo $dow . ' = ' . $weekday->format('l'); echo PHP_EOL . PHP_EOL; $dowISO = 7; $weekdayISO = (new DateTime('Sunday')) ->add(new DateInterval('P' . $dow . 'D')); echo $dowISO . ' = ' . $weekdayISO->format('l');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/3uthm
function name:  (null)
number of ops:  40
compiled vars:  !0 = $dow, !1 = $weekday, !2 = $dowISO, !3 = $weekdayISO
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 0
    4     1        NEW                                              $5      'DateTime'
          2        SEND_VAL_EX                                              'Sunday'
          3        DO_FCALL                                      0          
    5     4        INIT_METHOD_CALL                                         $5, 'add'
          5        NEW                                              $7      'DateInterval'
          6        CONCAT                                           ~8      'P', !0
          7        CONCAT                                           ~9      ~8, 'D'
          8        SEND_VAL_EX                                              ~9
          9        DO_FCALL                                      0          
         10        SEND_VAR_NO_REF_EX                                       $7
         11        DO_FCALL                                      0  $11     
    4    12        ASSIGN                                                   !1, $11
    7    13        CONCAT                                           ~13     !0, '+%3D+'
         14        INIT_METHOD_CALL                                         !1, 'format'
         15        SEND_VAL_EX                                              'l'
         16        DO_FCALL                                      0  $14     
         17        CONCAT                                           ~15     ~13, $14
         18        ECHO                                                     ~15
    9    19        ECHO                                                     '%0A%0A'
   11    20        ASSIGN                                                   !2, 7
   12    21        NEW                                              $17     'DateTime'
         22        SEND_VAL_EX                                              'Sunday'
         23        DO_FCALL                                      0          
   13    24        INIT_METHOD_CALL                                         $17, 'add'
         25        NEW                                              $19     'DateInterval'
         26        CONCAT                                           ~20     'P', !0
         27        CONCAT                                           ~21     ~20, 'D'
         28        SEND_VAL_EX                                              ~21
         29        DO_FCALL                                      0          
         30        SEND_VAR_NO_REF_EX                                       $19
         31        DO_FCALL                                      0  $23     
   12    32        ASSIGN                                                   !3, $23
   14    33        CONCAT                                           ~25     !2, '+%3D+'
         34        INIT_METHOD_CALL                                         !3, 'format'
         35        SEND_VAL_EX                                              'l'
         36        DO_FCALL                                      0  $26     
         37        CONCAT                                           ~27     ~25, $26
         38        ECHO                                                     ~27
         39      > RETURN                                                   1

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