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<?php $str = 'https://priorityplusqa.geiger.com'; $domain = explode('.', parse_url($str)[1]); var_dump($domain);
based on 2DgC3
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/7fS4K
function name:  (null)
number of ops:  14
compiled vars:  !0 = $str, !1 = $domain
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'https%3A%2F%2Fpriorityplusqa.geiger.com'
   4     1        INIT_FCALL                                               'explode'
         2        SEND_VAL                                                 '.'
         3        INIT_FCALL                                               'parse_url'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                         $3      
         6        FETCH_DIM_R                                      $4      $3, 1
         7        SEND_VAR                                                 $4
         8        DO_ICALL                                         $5      
         9        ASSIGN                                                   !1, $5
   5    10        INIT_FCALL                                               'var_dump'
        11        SEND_VAR                                                 !1
        12        DO_ICALL                                                 
        13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0