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<?php var_dump(ctype_digit('123')); var_dump(ctype_digit(123)); var_dump(ctype_digit('123.45'));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/0e5Gq
function name:  (null)
number of ops:  19
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'ctype_digit'
         2        SEND_VAL                                                 '123'
         3        DO_ICALL                                         $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
   3     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'ctype_digit'
         8        SEND_VAL                                                 123
         9        DO_ICALL                                         $2      
        10        SEND_VAR                                                 $2
        11        DO_ICALL                                                 
   4    12        INIT_FCALL                                               'var_dump'
        13        INIT_FCALL                                               'ctype_digit'
        14        SEND_VAL                                                 '123.45'
        15        DO_ICALL                                         $4      
        16        SEND_VAR                                                 $4
        17        DO_ICALL                                                 
        18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0