PHP array_unshift() function

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The array_unshift function inserts new values to the beginning of the array. In the case of the array with numeric keys, the newly inserted elements are assigned the numeric keys starting from 0 and increment by 1. However, string keys remain the same.

What is the syntax of the array_unshift function in PHP?

array_unshift(array, value1, value2, value3, ...)
ParameterDescription
arrayThe array to insert new values to – Required
value1Value to insert – Optional
value2Next value to insert – Optional
value,…More values to insert – Optional
array_unshift function in PHP

Examples of array_unshift function

Example 1. Insert new values in an array with string keys.

<?php
$arr=array("a"=>"R","b"=>"G");
print_r(array_unshift($arr,"B"));
?>

Example 2. Insert new values in an array with numeric keys.

<?php
$arr=array(0=>"R",1=>"G");
array_unshift($arr,"B");
print_r($arr);
?>
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