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(PECL ds >= 1.0.0)
Ds\Sequence::first — Returns the first value in the sequence
この関数にはパラメータはありません。
The first value in the sequence.
UnderflowException if empty.
例1 Ds\Sequence::first() example
<?php
$sequence = new \Ds\Vector([1, 2, 3]);
var_dump($sequence->first());
?>
上の例の出力は、 たとえば以下のようになります。
int(1)