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<?php $t = preg_split("/as/i", "felvido as 'Felvétel dátuma'"); var_dump($t);
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/JMWbf
function name:  (null)
number of ops:  9
compiled vars:  !0 = $t
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'preg_split'
         1        SEND_VAL                                                 '%2Fas%2Fi'
         2        SEND_VAL                                                 'felvido+as+%27Felv%C3%A9tel+d%C3%A1tuma%27'
         3        DO_ICALL                                         $1      
         4        ASSIGN                                                   !0, $1
   3     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0