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@ 2019-10-03T09:16:08Z

<?php

$country_codes = array('UK','IRL');

$country_list = array(
      'ALB' => 'Albania',
      'AND' => 'Andorra',
      'ARM' => 'Armenia',
      'AUT' => 'Austria',
      'AZE' => 'Azerbaijan',
      'BLR' => 'Belarus',
      'BEL' => 'Belgium',
      'BIH' => 'Bosnia and Herzegovina',
      'BGR' => 'Bulgaria',
      'HRV' => 'Croatia',
      'CYP' => 'Cyprus',
      'CZE' => 'Czech Republic',
      'DNK' => 'Denmark',
      'EST' => 'Estonia',
      'FIN' => 'Finland',
      'FRA' => 'France',
      'GEO' => 'Georgia',
      'DEU' => 'Germany',
      'GRC' => 'Greece',
      'HUN' => 'Hungary',
      'ISL' => 'Iceland',
      'IRL' => 'Ireland',
      'ITA' => 'Italy',
      'KAZ' => 'Kazakhstan',
      'RKS' => 'Kosovo',
      'LVA' => 'Latvia',
      'LIE' => 'Liechtenstein',
      'LTU' => 'Lithuania',
      'LUX' => 'Luxembourg',
      'MLT' => 'Malta',
      'MDA' => 'Moldova',
      'MCO' => 'Monaco',
      'MNE' => 'Montenegro',
      'NLD' => 'Netherlands',
      'MKD' => 'North Macedonia',
      'NOR' => 'Norway',
      'POL' => 'Poland',
      'PRT' => 'Portugal',
      'ROU' => 'Romania',
      'RUS' => 'Russia',
      'SMR' => 'San Marino',
      'SRB' => 'Serbia',
      'SVK' => 'Slovakia',
      'SVN' => 'Slovenia',
      'ESP' => 'Spain',
      'SWE' => 'Sweden',
      'CHE' => 'Switzerland',
      'TUR' => 'Turkey',
      'UKR' => 'Ukraine',
      'UK' => 'UK',
    );

$filtered_countries = array_intersect_key($country_list, array_flip($country_codes));
print_r($filtered_countries);

Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/EvvQu
function name:  (null)
number of ops:  14
compiled vars:  !0 = $country_codes, !1 = $country_list, !2 = $filtered_countries
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        ASSIGN                                                   !1, <array>
   58     2        INIT_FCALL                                               'array_intersect_key'
          3        SEND_VAR                                                 !1
          4        INIT_FCALL                                               'array_flip'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $5      
          7        SEND_VAR                                                 $5
          8        DO_ICALL                                         $6      
          9        ASSIGN                                                   !2, $6
   59    10        INIT_FCALL                                               'print_r'
         11        SEND_VAR                                                 !2
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

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