Ds\Sequence::first
(PECL ds >= 1.0.0)
Ds\Sequence::first — Returns the first value in the sequence
Description
abstract public Ds\Sequence::first(): mixed
Returns the first value in the sequence.
Parameters
This function has no parameters.
Return Values
The first value in the sequence.
Errors/Exceptions
UnderflowException if empty.
Examples
Example #1 Ds\Sequence::first() example
<?php $sequence = new \Ds\Vector([1, 2, 3]); var_dump($sequence->first()); ?>
The above example will output something similar to:
int(1)
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https://www.php.net/manual/en/ds-sequence.first.php