Question

Possible Duplicate:
array_splice() for associative arrays
How to add an array value to the middle of an associative array?

How can I add a new [key] => [value] pair after a specific Associative Key in an Assoc Array in PHP ?

For example, let’s say we have an array called $fruits:

array {
   [apple] => 1
   [banana] => 3
   [orange] => 4
}

How can I add [plum] => 2 to $fruits so that it appears after the [apple] key but before [banana] key ?

Thanks.

Answer 1

You’ll probably need to use array_splice() to cut the array into two pieces, and then recreate the array with array_merge() – Try this nifty function I just whipped up.

Live Sample: http://codepad.org/gGm5C1od

<?php
   $orig = array(
       "apple" => 1,
       "banana" => 3,
       "orange" => 4,
   );

   $orig = InsertKeyValuePair($orig, "plum", 2, 1);
   var_dump($orig);

   function InsertKeyValuePair($arr, $key, $val, $index){
      $arrayEnd = array_splice($arr, $index);
      $arrayStart = array_splice($arr, 0, $index);   
      return (array_merge($arrayStart, array($key=>$val), $arrayEnd ));
   }

?>