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<?php function date_interval_iso(DateInterval $interval, string $default = 'PT0F') { static $f = ['S0F', 'M0S', 'H0M', 'DT0H', 'M0D', 'P0Y', 'Y0M', 'P0M']; static $r = ['S', 'M', 'H', 'DT', 'M', 'P', 'Y', 'P']; return rtrim(str_replace($f, $r, $interval->format('P%yY%mM%dDT%hH%iM%sS%fF') ), 'PT') ?: $default; } $date1 = new DateTimeImmutable(); $date2 = new DateTimeImmutable(); //test 0 duration DateInterval echo date_interval_iso($date1->diff($date1)) . PHP_EOL; //test microseconds echo date_interval_iso($date2->diff($date1));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VFN7N
function name:  (null)
number of ops:  22
compiled vars:  !0 = $date1, !1 = $date2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   13     0  E >   NEW                                              $2      'DateTimeImmutable'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
   14     3        NEW                                              $5      'DateTimeImmutable'
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !1, $5
   17     6        INIT_FCALL                                               'date_interval_iso'
          7        INIT_METHOD_CALL                                         !0, 'diff'
          8        SEND_VAR_EX                                              !0
          9        DO_FCALL                                      0  $8      
         10        SEND_VAR                                                 $8
         11        DO_FCALL                                      0  $9      
         12        CONCAT                                           ~10     $9, '%0A'
         13        ECHO                                                     ~10
   20    14        INIT_FCALL                                               'date_interval_iso'
         15        INIT_METHOD_CALL                                         !1, 'diff'
         16        SEND_VAR_EX                                              !0
         17        DO_FCALL                                      0  $11     
         18        SEND_VAR                                                 $11
         19        DO_FCALL                                      0  $12     
         20        ECHO                                                     $12
         21      > RETURN                                                   1

Function date_interval_iso:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VFN7N
function name:  date_interval_iso
number of ops:  20
compiled vars:  !0 = $interval, !1 = $default, !2 = $f, !3 = $r
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV_INIT                                        !1      'PT0F'
    4     2        BIND_STATIC                                              !2
    5     3        BIND_STATIC                                              !3
    7     4        INIT_FCALL                                               'rtrim'
          5        INIT_FCALL                                               'str_replace'
          6        SEND_VAR                                                 !2
          7        SEND_VAR                                                 !3
    8     8        INIT_METHOD_CALL                                         !0, 'format'
          9        SEND_VAL_EX                                              'P%25yY%25mM%25dDT%25hH%25iM%25sS%25fF'
         10        DO_FCALL                                      0  $4      
         11        SEND_VAR                                                 $4
    7    12        DO_ICALL                                         $5      
    8    13        SEND_VAR                                                 $5
    9    14        SEND_VAL                                                 'PT'
    7    15        DO_ICALL                                         $6      
    9    16        JMP_SET                                          ~7      $6, ->18
         17        QM_ASSIGN                                        ~7      !1
         18      > RETURN                                                   ~7
   10    19*     > RETURN                                                   null

End of function date_interval_iso

Generated using Vulcan Logic Dumper, using php 8.0.0


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