How Can I Efficiently Insert Elements into Specific Array Positions in PHP?

Effective Array Manipulation: Inserting Elements at Specific Positions

Inserting elements into an array at a specified position is a common task in programming. Consider two arrays:

$array_1 = array(
  'zero' => 'zero',
  'one' => 'one',
  'two' => 'two',
  'three' => 'three',
);

$array_2 = array(
  'zero'  => '0',
  'one'   => '1',
  'two'   => '2',
  'three' => '3',
);

Suppose you want to insert the element array('sample_key' => 'sample_value') after the third element of each array.

The array_slice() function can assist you in extracting parts of the array. To insert the element, concatenate the parts using the union array operator ( ).

$res = array_slice($array, 0, 3, true) +
    array("my_key" => "my_value") +
    array_slice($array, 3, count($array)-3, true);

In this example:

$array = array(
  'zero'  => '0',
  'one'   => '1',
  'two'   => '2',
  'three' => '3',
);
$res = array_slice($array, 0, 3, true) +
    array("my_key" => "my_value") +
    array_slice($array, 3, count($array) - 1, true) ;
print_r($res);

The output is:

Array
(
    [zero] => 0
    [one] => 1
    [two] => 2
    [my_key] => my_value
    [three] => 3
)

This technique effectively inserts the desired element into the specified position of both arrays.

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