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PHP array_unshift() Function

PHP array_unshift() function is used to add one or more elements into any given array. These elements are added at the beginning of the given array. All the elements are inserted to the array in the same order as they have been passed.

Syntax:

array_unshift(array, value1, value2, value3, ...);

Parameter Values

Parameter	Description
array	This is a required parameter. This parameter defines the given array.
value1	This is an optional parameter. This parameter defines a value to insert.
value2	This is an optional parameter. This parameter defines another value to insert.
value3	This is an optional parameter. This parameter defines more values to insert.

Here is an example of array_unshift() function in PHP:

<html>
<body>
<pre>
<?php
$x=array("M","A","N","Y","U");
array_unshift($x,"A","B","H","I");
print_r($x);
?>
</pre>
</body>
</html>

Output:

Array
(
    [0] => A
    [1] => B
    [2] => H
    [3] => I
    [4] => M
    [5] => A
    [6] => N
    [7] => Y
    [8] => U
)

Example 2:

<html>
<body>
<pre>
<?php
for($i=10;$i<=15;$i++)
{
$x[]=$i;
}
echo "Before the unshift(): <br>";
print_r($x);
for($i=9;$i>=0;$i--)
{
array_unshift($x,$i);
}
echo "<br>After the unshift(): <br>";
print_r($x);
?>
</pre>
</body>
</html>

Output:

Before the unshift(): 
Array
(
    [0] => 10
    [1] => 11
    [2] => 12
    [3] => 13
    [4] => 14
    [5] => 15
)

After the unshift(): 
Array
(
    [0] => 0
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 5
    [6] => 6
    [7] => 7
    [8] => 8
    [9] => 9
    [10] => 10
    [11] => 11
    [12] => 12
    [13] => 13
    [14] => 14
    [15] => 15
)

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