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Merge two arrays keeping original keys in PHP

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Problem: How to merge two arrays while keeping keys instead of reindexing in PHP? Solution: This can be achieved in two ways which are by using + operator and by using inbuilt functions. Method 1: Using + operator. Example :
<?php
$array1 = array(
         1 =>'Geeks',
         2 =>'For',
         3 =>'Geeks'
          );
  
 $array2 = array(
          4 => 'A',
          5 => 'Computer',
          6 => 'Science',
          7 => 'Portal',
          8 => 'For',
          9 => 'Geeks'
         );
  
  $merged_array = $array1 + $array2;
  var_dump ($merged_array);
?>

                    
Output:
array(9) {
  [1]=>
  string(5) "Geeks"
  [2]=>
  string(3) "For"
  [3]=>
  string(5) "Geeks"
  [4]=>
  string(1) "A"
  [5]=>
  string(8) "Computer"
  [6]=>
  string(7) "Science"
  [7]=>
  string(6) "Portal"
  [8]=>
  string(3) "For"
  [9]=>
  string(5) "Geeks"
}
Method 2: Using inbuilt function array_replace() function. Example :
<?php
$array1 = array(
         1 =>'Geeks',
         2 =>'For',
         3 =>'Geeks'
          );
  
 $array2 = array(
          4 => 'A',
          5 => 'Computer',
          6 => 'Science',
          7 => 'Portal',
          8 => 'For',
          9 => 'Geeks'
         );
  
  $merged_array = array_replace($array1, $array2);
  var_dump ($merged_array);
?>

                    
Output:
array(9) {
  [1]=>
  string(5) "Geeks"
  [2]=>
  string(3) "For"
  [3]=>
  string(5) "Geeks"
  [4]=>
  string(1) "A"
  [5]=>
  string(8) "Computer"
  [6]=>
  string(7) "Science"
  [7]=>
  string(6) "Portal"
  [8]=>
  string(3) "For"
  [9]=>
  string(5) "Geeks"
}
Reference :http://php.net/manual/en/function.array-replace.php

Last Updated : 11 Nov, 2018
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