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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:  7
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        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F.%2A+rate+%28%5Cd%2B%29.%2A%2F', '%241'
          3        OP_DATA                                                      !0
          4        SEND_VAL                                                     ~2
    4     5        DO_ICALL                                                     
    6     6      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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