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<?php $characters = ["A", "$", "\n", "\u{2603}"]; foreach ($characters as $character) { var_dump(IntlChar::isIDStart($character)); } ?>
based on l3GZp
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 2, Position 2 = 10
Branch analysis from position: 2
Jump found. Position 1 = 3, Position 2 = 10
Branch analysis from position: 3
Jump found. Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 10
Jump found. Position 1 = -2
Branch analysis from position: 10
filename:       /in/1OsPb
function name:  (null)
number of ops:  12
compiled vars:  !0 = $characters, !1 = $character
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   3     1      > FE_RESET_R                                       $3      !0, ->10
         2    > > FE_FETCH_R                                               $3, !1, ->10
   4     3    >   INIT_FCALL                                               'var_dump'
         4        INIT_STATIC_METHOD_CALL                                  'IntlChar', 'isIDStart'
         5        SEND_VAR_EX                                              !1
         6        DO_FCALL                                      0  $4      
         7        SEND_VAR                                                 $4
         8        DO_ICALL                                                 
         9      > JMP                                                      ->2
        10    >   FE_FREE                                                  $3
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0