Ds\Vector::first

(PECL ds >= 1.0.0)

Ds\Vector::first — Returns the first value in the vector

说明

public Ds\Vector::first ( void ) : mixed

Returns the first value in the vector.

参数

此函数没有参数。

返回值

The first value in the vector.

错误／异常

UnderflowException if empty.

范例

Example #1 Ds\Vector::first() example

<?php
$vector = new \Ds\Vector([1, 2, 3]);
var_dump($vector->first());
?>

以上例程的输出类似于：

int(1)
相关文章
php deque returns the first value in the dequephp deque removes and returns the first valuephp sequence returns the first value in the sequencephp sequence removes and returns the first valuephp set returns the first value in the setphp vector returns the first value in the vectorphp vector returns the value at a given indexphp vector returns the last valuephp vector returns the result of applying a callback to each valuephp vector removes and returns the last valuephp vector removes and returns a value by indexphp vector removes and returns the first valuephp sqlite 函数 executes a query and returns either an array for one single column or the value of the first rowphp statistic 函数 returns the t value from the independent two sample t testphp yp/nis 函数 returns the first key value pair from the named mapphp imagick returns a value associated with the specified keyphp pht queue returns the first value from a queuephp pht vector shifts a value from the vectorphp solrquery returns the value for the facet.date.other parameterphp splfixedarray returns the value at the specified index
关注编程学问公众号