PHP array_unshift() function

The array_unshift( ) function is an inbuilt function of PHP. It is used to add one or more elements to the beginning of an array. This function was introduced in PHP 4.0.

Syntax

Parameters

Parameter	Description	Is compulsory
array	The input array.	compulsory
List of values	The values to prepend.	compulsory

Return Values

The array_unshift( ) function returns the new number of elements in the array.

Important note:

All numerical array keys will be modified to start counting from zero while literal keys won't be changed.

Example 1

<?php
$site = array('java', 't', 'point'); 
array_unshift($site, 1, 2, 3); 
foreach ($site as $element) 
{ 
		print_r("$element "); 
} 
?>

Output:

1 2 3 java t point

Example 2

<?php
$cricket = array("virat", "rohit", "pandeya");
$a1 = "sachin";
$a2 = "sehwag";
$a3 = "harbhajan";
array_unshift($cricket, $a1, $a2, $a3);
print_r($cricket);
?>

Output:

Array
(
    [0] =>sachin
    [1] =>sehwag
    [2] =>harbhajan
    [3] =>virat
    [4] =>rohit
    [5] =>pandeya
)

Example 3

<?php
$laptop = array('dell',  'hp');
array_unshift($laptop, 'leneovo', 'acer');
print_r($laptop);
?>

Output:

Array
(
    [0] =>leneovo
    [1] =>acer
    [2] => dell
    [3] =>hp)

Example 4

<?php
$city = array("bangalore", "delhi");
array_unshift($city, "pune", "kolkata");
print_r($city);
?>

Output:

Array
(
    [0] =>pune
    [1] =>kolkata
    [2] =>bangalore
    [3] =>delhi
)

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