How can we insert a new item into an array on any position, say for example in the middle of array?

or

How can we insert a new item into an array on any position?

php arrays insert

It only requires one function call to array_splice:

Php Code 
$original = array( ‘w', ‘i', ‘k', ‘e', ‘t' );
$inserted = array( 'x' ); // Not necessarily an array

array_splice( $original, 3, 0, $inserted ); // splice in at position 3
// $original is now w i k x e t

Here is the solution for insert arrays:

Php Code 
function array_insert(&$array, $value, $index)
{
    return $array = array_merge(array_splice($array, max(0, $index - 1)), array($value), $array);
}

A function that can insert at both integer and string positions:

Php Code 
/**
 * @param array      $array
 * @param int|string $position
 * @param mixed      $insert
 */
function array_insert(&$array, $position, $insert)
{
    if (is_int($position)) {
        array_splice($array, $position, 0, $insert);
    } else {
        $pos   = array_search($position, array_keys($array));
        $array = array_merge(
            array_slice($array, 0, $pos),
            $insert,
            array_slice($array, $pos)
        );
    }
}

Integer usage:

Php Code 
$arr = ["one", "two", "three"];
array_insert(
    $arr,
    1,
    "one-half"
);
// ->
array (
  0 => 'one',
  1 => 'one-half',
  2 => 'two',
  3 => 'three',
)

String Usage:

Php Code 
$arr = [
    "name"  => [
        "type"      => "string",
        "maxlength" => "40",
    ],
    "email" => [
        "type"      => "email",
        "maxlength" => "160",
    ],
];

array_insert(
    $arr,
    "email",
    [
        "phone" => [
            "type"   => "string",
            "format" => "phone",
        ],
    ]
);
Php Code 
// ->
array (
  'name' =>
  array (
    'type' => 'string',
    'maxlength' => '40',
  ),
  'phone' =>
  array (
    'type' => 'string',
    'format' => 'phone',
  ),
  'email' =>
  array (
    'type' => 'email',
    'maxlength' => '160',
  ),
)
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We can use this:

Php Code 
foreach ($array as $key => $value) 
{
    if($key==1)
    {
        $new_array[]=$other_array;
    }   
    $new_array[]=$value;    
}

Here is the another Solution: –

PHP Code:

Php Code 
<?php  
$original = array( '1','2','3','4','5' );  
echo 'Original array : '."\n";  
foreach ($original as $x)   
{echo "$x ";}  
$inserted = '$';  
array_splice( $original, 3, 0, $inserted );   
echo " \n After inserting '$' the array is : "."\n";  
foreach ($original as $x)   
{echo "$x ";}  
echo "\n"  
?>

Sample Output:

Original array :
1 2 3 4 5
After inserting ‘$’ the array is :
1 2 3 $ 4 5

  • splice method can be used for adding and/or removing elements from an array.
  • The first argument specifies the location at which to begin adding or removing elements.
  • The second argument specifies the number of elements to delete.
  • When using splice to add elements to an array, the second argument would be zero.
  • The third and subsequent arguments are elements to be added to the array.
Php Code 
var ar = [1, 2, 3, 4, 5, 6];
// arguments: start position, number of elements to delete, elements to add
ar.splice(3, 0, ‘d', ‘e', ‘f');

console.log( ar ); // [1, 2, 3, “d", “e", “f", 4, 5, 6]
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Hint for adding an element at the beginning of an array:

Php Code 
$a = array('first', 'second');
$a[-1] = 'i am the new first element';

then:

Php Code 
foreach($a as $aelem)
    echo $a . ' ';
//returns first, second, i am...

but:

Php Code 
for ($i = -1; $i < count($a)-1; $i++)
     echo $a . ' ';
//returns i am as 1st element

  • Add Elements to the Beginning of an Array:
  • unshift method is used to add elements to the beginning of an array.
  • It accepts multiple arguments, adjusts the indexes of existing elements, and returns the new length of the array.
  • The unshift method modifies the array on which it is invoked.

First we invoke unshift passing a single argument, then multiple arguments, displaying the results using console.log:

Php Code 
var ar = ['one', 'two', 'three'];
// add single element
ar.unshift('zero');
console.log( ar ); // ["zero", "one", "two", "three"]

// add multiple elements
ar.unshift(0, 1, 2, 3);
console.log( ar ); // [0, 1, 2, 3, "zero", "one", "two", "three"]

Here is simple function for insert new element after a specific key, while preserving integer keys:

Php Code 
private function arrayInsertAfterKey($array, $afterKey, $key, $value){
    $pos   = array_search($afterKey, array_keys($array));

    return array_merge(
        array_slice($array, 0, $pos, $preserve_keys = true),
        array($key=>$value),
        array_slice($array, $pos, $preserve_keys = true)
    );
}

Normally, with scalar values:

Php Code 
$elements = array('foo', ...);
array_splice($array, $position, $length, $elements);

To insert a single array element into our array don’t forget to wrap the array in an array (as it was a scalar value!):

Php Code 
$element = array('key1'=>'value1');
$elements = array($element);
array_splice($array, $position, $length, $elements);
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