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<?php $line = 'tc class add dev br-lan parent 1:1 classid 1:2 htb rate 100kbit ceil 100kbit'; var_dump( preg_replace('/.* rate (\d+).*/', '$1', $line) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/nUA57
function name:  (null)
number of ops:  10
compiled vars:  !0 = $line
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'tc+class+add+dev+br-lan+parent+1%3A1+classid+1%3A2+htb+rate+100kbit+ceil+100kbit'
    4     1        INIT_FCALL                                               'var_dump'
    5     2        INIT_FCALL                                               'preg_replace'
          3        SEND_VAL                                                 '%2F.%2A+rate+%28%5Cd%2B%29.%2A%2F'
          4        SEND_VAL                                                 '%241'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
    4     8        DO_ICALL                                                 
    6     9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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