PHP ��U
前一頁 |  | 下一頁

# prev

(PHP 3, PHP 4, PHP 5)

prev -- Rewind the internal array pointer

## Description

mixed prev ( array &array )

Returns the array value in the previous place that's pointed to by the internal array pointer, or `FALSE` if there are no more elements.

警告
�o�Ө�ƥi��^�ǥ�L�� `FALSE`�A��]�i��^�Ǥ@�ӦP�� `FALSE` �D�L�ȡA�O0�� ""�аѦ�Booleans�`��h��T�C�ϥ� === �B��l�Ӵ�ճo�Ө�ƪ�^�ǭȡC

> 注: You won't be able to distinguish the beginning of an array from a boolean `FALSE` element. To properly traverse an array which may contain `FALSE` elements, see the each() function.

prev() behaves just like next(), except it rewinds the internal array pointer one place instead of advancing it.

範例 1. Example use of prev() and friends

`<?php $transport = array('foot', 'bike', 'car', 'plane'); $mode = current($transport); // $mode = 'foot'; $mode = next($transport); // $mode = 'bike'; $mode = next($transport); // $mode = 'car'; $mode = prev($transport); // $mode = 'bike'; $mode = end($transport); // $mode = 'plane'; ?>`

See also current(), end(), next(), reset(), and each().

前一頁 | 內容 | 下一頁
pos | 上一層 | range