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<?php $dt = \DateTime::createFromFormat('Y-m-d', '2018-10-31'); $dt2 = $dt; // 月初 echo $dt->modify('first day of 00:00:00')->modify('next month')->format('Y-m-d'); // 2018-11-01 echo $dt2->modify('first day of 00:00:00')->modify('last month')->format('Y-m-d'); // 2018-10-01
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LtaNq
function name:  (null)
number of ops:  27
compiled vars:  !0 = $dt, !1 = $dt2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_STATIC_METHOD_CALL                                  'DateTime', 'createFromFormat'
          1        SEND_VAL                                                 'Y-m-d'
          2        SEND_VAL                                                 '2018-10-31'
          3        DO_FCALL                                      0  $2      
          4        ASSIGN                                                   !0, $2
    4     5        ASSIGN                                                   !1, !0
    7     6        INIT_METHOD_CALL                                         !0, 'modify'
          7        SEND_VAL_EX                                              'first+day+of+00%3A00%3A00'
          8        DO_FCALL                                      0  $5      
          9        INIT_METHOD_CALL                                         $5, 'modify'
         10        SEND_VAL_EX                                              'next+month'
         11        DO_FCALL                                      0  $6      
         12        INIT_METHOD_CALL                                         $6, 'format'
         13        SEND_VAL_EX                                              'Y-m-d'
         14        DO_FCALL                                      0  $7      
         15        ECHO                                                     $7
    8    16        INIT_METHOD_CALL                                         !1, 'modify'
         17        SEND_VAL_EX                                              'first+day+of+00%3A00%3A00'
         18        DO_FCALL                                      0  $8      
         19        INIT_METHOD_CALL                                         $8, 'modify'
         20        SEND_VAL_EX                                              'last+month'
         21        DO_FCALL                                      0  $9      
         22        INIT_METHOD_CALL                                         $9, 'format'
         23        SEND_VAL_EX                                              'Y-m-d'
         24        DO_FCALL                                      0  $10     
         25        ECHO                                                     $10
         26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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