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<?php $a = "3"; $hasPrefix = substr($a, 0, 1) == '_'; var_dump($hasPrefix); var_dump(intval($a));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Xt4u6
function name:  (null)
number of ops:  16
compiled vars:  !0 = $a, !1 = $hasPrefix
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '3'
   4     1        INIT_FCALL                                               'substr'
         2        SEND_VAR                                                 !0
         3        SEND_VAL                                                 0
         4        SEND_VAL                                                 1
         5        DO_ICALL                                         $3      
         6        IS_EQUAL                                         ~4      $3, '_'
         7        ASSIGN                                                   !1, ~4
   5     8        INIT_FCALL                                               'var_dump'
         9        SEND_VAR                                                 !1
        10        DO_ICALL                                                 
   6    11        INIT_FCALL                                               'var_dump'
        12        CAST                                          4  ~7      !0
        13        SEND_VAL                                                 ~7
        14        DO_ICALL                                                 
        15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0