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<?php $strValue = '34'; if(!ctype_digit((string) $strValue)){ echo true; } else { echo false; }
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
Jump found. Position 1 = 10
Branch analysis from position: 10
Jump found. Position 1 = -2
Branch analysis from position: 9
Jump found. Position 1 = -2
filename:       /in/5LSDh
function name:  (null)
number of ops:  11
compiled vars:  !0 = $strValue
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '34'
   4     1        INIT_FCALL                                               'ctype_digit'
         2        CAST                                          6  ~2      !0
         3        SEND_VAL                                                 ~2
         4        DO_ICALL                                         $3      
         5        BOOL_NOT                                         ~4      $3
         6      > JMPZ                                                     ~4, ->9
   5     7    >   ECHO                                                     <true>
         8      > JMP                                                      ->10
   7     9    >   ECHO                                                     <false>
        10    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0