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<?php $x = preg_match('/\d+/', 'xxx3xxxx1', $y); echo $x; print_r($y);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/r9eso
function name:  (null)
number of ops:  11
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2F%5Cd%2B%2F'
          2        SEND_VAL                                                 'xxx3xxxx1'
          3        SEND_REF                                                 !1
          4        DO_ICALL                                         $2      
          5        ASSIGN                                                   !0, $2
    3     6        ECHO                                                     !0
    4     7        INIT_FCALL                                               'print_r'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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