|
|
 |
current (PHP 3, PHP 4 , PHP 5) current -- 返回数组中的当前单元 说明mixed current ( array array)
每个数组中都有一个内部的指针指向它“当前的”单元，初始指向插入到数组中的第一个单元。
current() 函数返回当前被内部指针指向的数组单元的值，并不移动指针。如果内部指针指向超出了单元列表的末端，current()
返回 FALSE。
| 警告 |
如果数组包含有空的单元（0 或者 ""，空字符串）则本函数在碰到这个单元时也返回
FALSE。这使得用 current() 不可能判断是否到了此数组列表的末端。要正确遍历可能含有空单元的数组，用
each() 函数。
|
例子 1. current() 及相关函数的用法示例 |
<?php
$transport = array('foot', 'bike', 'car', 'plane');
$mode = current($transport); // $mode = 'foot';
$mode = next($transport); // $mode = 'bike';
$mode = current($transport); // $mode = 'bike';
$mode = prev($transport); // $mode = 'foot';
$mode = end($transport); // $mode = 'plane';
$mode = current($transport); // $mode = 'plane';
?>
|
|
参见 end()，key()，next()，prev()
和 reset()。
retestro_REMOVE at SPAM_esperanto dot org dot il
02-Mar-2003 10:31
The docs do not specify this, but adding to the array using the brackets
syntax:
$my_array[] = $new_value;
will not advance the internal
pointer of the array. therefore, you cannot use current() to get the last
value added or key() to get the key of the most recently added
element.
You should do an end($my_array) to advance the internal
pointer to the end ( as stated in one of the notes on end() ), then
$last_key = key($my_array); // will return the key
$last_value = current($my_array); // will return the value
If you
have no need in the key, $last_value = end($my_array) will also do the
job.
- Sergey.
| |
count
