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<?php $video_id = null; sscanf( '/1458', '/%d', $video_id ); var_dump($video_id);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/BlFsf
function name:  (null)
number of ops:  10
compiled vars:  !0 = $video_id
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, null
   3     1        INIT_FCALL                                               'sscanf'
   4     2        SEND_VAL                                                 '%2F1458'
   5     3        SEND_VAL                                                 '%2F%25d'
         4        SEND_REF                                                 !0
         5        DO_ICALL                                                 
   8     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !0
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0