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<?php $respuesta="ashjjaaáéíóúajajda"; echo $respuesta= ereg_replace("[^\x00-\x7F]+", "", $respuesta);
based on eGOaA
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/6NGVO
function name:  (null)
number of ops:  9
compiled vars:  !0 = $respuesta
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   ASSIGN                                                   !0, 'ashjjaa%C3%83%C2%A1%C3%83%C2%A9%C3%83%C2%AD%C3%83%C2%B3%C3%83%C2%BAajajda'
   6     1        INIT_FCALL_BY_NAME                                       'ereg_replace'
         2        SEND_VAL_EX                                              '%5B%5E%00-%7F%5D%2B'
         3        SEND_VAL_EX                                              ''
         4        SEND_VAR_EX                                              !0
         5        DO_FCALL                                      0  $2      
         6        ASSIGN                                           $3      !0, $2
         7        ECHO                                                     $3
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0