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<?php var_dump(url_decode("/s"));
based on aM161
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/Cmdpb
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL_BY_NAME                                       'url_decode'
         2        SEND_VAL_EX                                              '%2Fs'
         3        DO_FCALL                                      0  $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0