Ds\Sequence::unshift
(PECL ds >= 1.0.0)
Ds\Sequence::unshift — Adds values to the front of the sequence
Description
abstract public Ds\Sequence::unshift ([ mixed $values ] ) : void
Adds values to the front of the sequence, moving all the current values forward to make room for the new values.
Parameters
-  values
-  The values to add to the front of the sequence. Note: Multiple values will be added in the same order that they are passed. 
Return Values
No value is returned.
Examples
Example #1 Ds\Sequence::unshift() example
<?php
$sequence = new \Ds\Vector([1, 2, 3]);
$sequence->unshift("a");
$sequence->unshift("b", "c");
print_r($sequence);
?> The above example will output something similar to:
Ds\Vector Object
(
    [0] => b
    [1] => c
    [2] => a
    [3] => 1
    [4] => 2
    [5] => 3
)
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    https://www.php.net/manual/en/ds-sequence.unshift.php