PHP 8.3.0 RC 6 available for testing

next

(PHP 4, PHP 5, PHP 7, PHP 8)

next 将数组中的内部指针向前移动一位

说明

next(array|object &$array): mixed

next()current() 的行为类似,只有一点区别,在返回值之前将内部指针向前移动一位。这意味着它返回的是下一个数组单元的值并将数组指针向前移动了一位。

参数

array

受影响的 array

返回值

返回数组内部指针指向的下一个单元的值,或当没有更多单元时返回 false

警告

此函数可能返回布尔值 false,但也可能返回等同于 false 的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

更新日志

版本 说明
8.1.0 弃用在 object 上调用此函数。 要么首先使用 get_mangled_object_vars()object 转换为 array,要么使用实现 Iterator 的类提供的方法,例如 ArrayIterator
7.4.0 SPL 类的实例现在被视为没有属性的空对象,而不是调用与此函数同名的 Iterator 方法。

示例

示例 #1 next() 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';
$mode = next($transport); // $mode = 'car';
$mode = prev($transport); // $mode = 'bike';
$mode = end($transport); // $mode = 'plane';
?>

注释

注意: 很难区别是到了数组尾部还是元素为 bool false 。要正确遍历可能含有 false 单元的数组,参见 foreach 函数。 仍要使用 next() 并正确检测是否到了数组尾部,需要检查 key() 是否为 null

参见

  • current() - 返回数组中的当前值
  • end() - 将数组的内部指针指向最后一个单元
  • prev() - 将数组的内部指针倒回一位
  • reset() - 将数组的内部指针指向第一个单元
  • each() - 返回数组中当前的键/值对并将数组指针向前移动一步

add a note

User Contributed Notes 19 notes

up
21
JumpIfBelow
6 years ago
Now from PHP 7.2, the function "each" is deprecated, so the has_next I've posted is no longer a good idea. There is another to keep it simple and fast:

<?php
function has_next(array $_array)
{
return
next($_array) !== false ?: key($_array) !== null;
}
?>
up
3
nigra
5 years ago
This function will return the previous,next neighbors of an array entry within an associative array. If the specified $key points to the last or first element of the array, the first or last keys of the array will be returned consecutively. This is an improved version of the same function posted earlier.

<?php
function array_neighbor($count, $key = null, $arRelated = array(), $cntRelated = 2)
{
if(
$count > 0 && isset($key))
{
$keyL = $count - 1;
$keyR = 1;
$arResult = array();
for(
$i = 1; $i <= $cntRelated; $i++)
{
if(
$key == 0)
{
if((
$i % 2) == 0)
{
$curKey = $count - $keyL;
$keyL--;
}
else
{
$curKey = $count - $keyR;
$keyR++;
}
}
else
{
if(
$arRelated[$i] >= $count - 1)
{
$curKey = 0;
}
else
{
$curKey = $arRelated[$i] + 1;
}
}
$arResult[$i] = $curKey;
}
return
$arResult;
}
}

$arr = range(0, 4);
$count = count($arr);

foreach(
$arr as $key => $v)
{
if(
$arRelated = array_neighbor($count, $key, $arRelated))
{
$arHeighbor[$key]['RELATED'] = $arRelated;
}
}

echo
'<pre>';print_r($arHeighbor); echo '</pre>';
?>
Array
(
[0] => Array
(
[RELATED] => Array
(
[1] => 4
[2] => 1
)

)

[1] => Array
(
[RELATED] => Array
(
[1] => 0
[2] => 2
)

)

[2] => Array
(
[RELATED] => Array
(
[1] => 1
[2] => 3
)

)

[3] => Array
(
[RELATED] => Array
(
[1] => 2
[2] => 4
)

)

[4] => Array
(
[RELATED] => Array
(
[1] => 3
[2] => 0
)

)

)
up
1
andy at andysdrawings dot co dot uk
5 years ago
brentimus' array_set_pointer function will only work if the array value is unique in the array, and none of the array values are FALSE. It would be more reliable to use key() instead of current(). For similar reasons it's better to check key() after calling next() to determine whether the next() element "exists". Simply checking the value returned by next() will produce a false negative when looking at, for example, the first element of the array: ['one', 0, 'three']

However, it also turns out that the copied array retains the original array's pointer, so array_set_pointer is not actually required here. The following should work:

<?php
function has_next(array &$array) {
$A_work = $array; // $A_work is a copy of $array including its internal pointer.
next($A_work);
if (
key($A_work) === NULL)
return
false;
else
return
true;
}
?>
up
1
notImportant
5 years ago
a more readable version of papipo's has_next function:

<?php
function has_next($array) {
$has_next = is_array($array) && next($array) !== false;

return
$has_next;
}
?>

OR

<?php
function has_next($array) {
$has_next = false;
if(
is_array($array)) {
$has_next = next($array) !== false;
}

return
$has_next;
}
?>
up
6
gg2005 at gmail dot com
16 years ago
Don't confuse next with continue!

If you're a Perl developer starting with PHP, you might try to use "next" inside a loop to skip to the next iteration...

i.e.,

foreach ($things as $thing) {
if (something I don't like about $thing) {
next;
}
blah....
}

The php compiler will take next... but it's not going to work.

Do this instead:
foreach ($things as $thing) {
if (something I don't like about $thing) {
continue;
}
blah....
}
up
4
court shrock
19 years ago
This code returns neighbors of the specified key. The result will be empty if it doesn't have any neighbors. My approach was to use the order of keys to determine neighbors, which is differnet from just getting the next/previous element in an array. Feel free to point out stupidities :)

<?php

function array_neighbor($arr, $key)
{
krsort($arr);
$keys = array_keys($arr);
$keyIndexes = array_flip($keys);

$return = array();
if (isset(
$keys[$keyIndexes[$key]-1]))
$return[] = $keys[$keyIndexes[$key]-1];
if (isset(
$keys[$keyIndexes[$key]+1]))
$return[] = $keys[$keyIndexes[$key]+1];

return
$return;
}

?>
up
2
double at dumpit dot de
13 years ago
PHP: 5.2.10-2ubuntu6.3 (default apt-get installation on actual, see Date, jaunty 9.10 Ubuntu Distro - G33kWoRDs)

Have a look at your array pointer if you copy an array - the pointer will be copied, too.

For example if you got this construct:
<?php
$array
= array('zero','one','two','three','four','five','six','seven');
$array2 = $array;
next($array);
echo
key($array);
echo
key($array2);

// will output:
// 1
// 0
?>

But if you copy the array after you've setted the pointer, the pointer will be copied, too:
<?php
$array
= array('zero','one','two','three','four','five','six','seven');
next($array);
$array2 = $array;
echo
key($array);
echo
key($array2);

// will output:
// 1
// 1
?>

What's more is, that foreach not resetting the pointer after walk through:
<?php

$array
= array('zero','one','two','three','four','five','six','seven');
next($array);
$array2 = array();
foreach(
$array AS $key => $value){
echo
$key;
$array2[$key] = $value;
}
echo
var_dump(key($array));
echo
key($array2);

// will output for foreach:
// 0 1 2 3 4 5 6 7
// and for the keys
// NULL
// 0
?>

The php-functions seems to reset the pointer on the given position after walk through (i don't know the internal handling - there could be used a copy of the array, too):
<?php

$array
= array('zero','one','two','three','four','five','six','seven');
next($array);
$array2 = array_values($array);
echo
key($array);
echo
key($array2);

// will output:
// 1
// 0
?>

There are a lot Methods like array_merge($array) that will neither reset the pointer of $array nor copy the pointer to $array2. Have a look on this.
I Hope this was a little helpfull.
up
4
brentimus
18 years ago
Papipo's function below is usefull in concept but does not work.

"Since you do not pass the array by reference, its pointer is only moved inside the function."

This is true, but the array you are manipulating in your has_next() function will have it's pointer set to the first element, not the same position as the original array. What you want to do is pass the array to the has_next() function via reference. While in the has_next() function, make a copy of the array to work on. Find out the current pointer position of the original array and set the pointer on the working copy of the array to the same element. Then you may test to see if the array has a "next" element.

Try the followig insetad:

<?php
function has_next(&$array)
{
$A_work=$array; //$A_work is a copy of $array but with its internal pointer set to the first element.
$PTR=current($array);
array_set_pointer($A_work, $PTR);

if(
is_array($A_work))
{
if(
next($A_work)===false)
return
false;
else
return
true;
}
else
return
false;
}

function
array_set_pointer(&$array, $value)
{
reset($array);
while(
$val=current($array))
{
if(
$val==$value)
break;

next($array);
}
}
?>
up
2
bm at ANTISPAM dot solidwave dot com
19 years ago
Take care when replacing code using reset()/next() with code using foreach as foreach does not update the array's internal pointer. This means you cannot, say, use next() to skip an element in foreach loop, or use current() within a function to get a reference to the current element. You probably have code depending on this internal pointer and replacing it will be more work than you anticipated.

See http://www.php.net/foreach
up
2
papipo's gmail account
19 years ago
I need to know if an array has more items, but without moving array's internail pointer. Thats is, a has_next() function:

<?php
function has_next($array) {
if (
is_array($array)) {
if (
next($array) === false) {
return
false;
} else {
return
true;
}
} else {
return
false;
}
}

$array = array('fruit', 'melon');
if (
has_next($array)) {
echo
next($array);
}

// prints 'melon'
?>

Since you do not pass the array by reference, its pointer is only moved inside the function.
Hope that helps.
up
0
tecdoc at ukr dot net
9 hours ago
It is good example how to loop array by current() and next() functions from php key() manual. In my opinion, this particular example would be better placed in current() and next() than key() manuals.

<?php
$array
= array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');

// this cycle echoes all associative array
// key where value equals "apple"
reset($array); // prepare array for cycle
while ($fruit_name = current($array)) {
if (
$fruit_name == 'apple') {
echo
key($array), "\n";
}
next($array);
}
?>
up
0
tecdoc at ukr dot net
9 hours ago
Be attentive! It is possibility to lose the array pointer with next() and prev();
<?php
// example
$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');

reset($array); // prepare array

$row = current($array);
var_dump($row); // 'apple'

$row = prev($array);
var_dump($row); // false. The array pointer is lossed!

$row = next($array); // it is not possible to return to the previous (first/last element)!
var_dump($row); // false
?>
up
0
Anonymous
1 year ago
This is the best example of using next in a loop

<?php
$array
= array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');

// this cycle echoes all associative array
// key where value equals "apple"
reset($array); // prepare array for cycle
while ($fruit_name = current($array)) {
if (
$fruit_name == 'apple') {
echo
key($array), "\n";
}
next($array);
}
reset($array);
?>
up
0
Mikhail
4 years ago
This function returns next element in array after your key or false if it last or key doesn't exists in array.

<?php

function nextElement(array $array, $currentKey)
{
if (!isset(
$array[$currentKey])) {
return
false;
}
$nextElement = false;
foreach (
$array as $key => $item) {
$nextElement = next($array);
if (
$key == $currentKey) {
break;
}
}

return
$nextElement;
}
up
0
ThinkMedical at Gmail dot com
15 years ago
regarding references with foreach, you can use them directly. Obviating various posts which provide many lines of 'work arounds'.

$array = array(1,2,3,4,5);

foreach($array as &$value)

or use $key

foreach($array as $key => $value)
{
$array[$key] = '...';
}
up
0
lukasz at karapuda dot com
19 years ago
This function will return the previous,next neighbors of an array entry within an associative array. If the specified $key points to the last or first element of the array, the first or last keys of the array will be returned consecutively. This is an improved version of the same function posted earlier.

<?php
function array_neighbor($arr, $key)
{
$keys = array_keys($arr);
$keyIndexes = array_flip($keys);

$return = array();
if (isset(
$keys[$keyIndexes[$key]-1])) {
$return[] = $keys[$keyIndexes[$key]-1];
}
else {
$return[] = $keys[sizeof($keys)-1];
}

if (isset(
$keys[$keyIndexes[$key]+1])) {
$return[] = $keys[$keyIndexes[$key]+1];
}
else {
$return[] = $keys[0];
}

return
$return;
}
?>
up
-1
darkside at i dot ua
15 years ago
This class implements simple operations with array

<?php
class Steps {

private
$all;
private
$count;
private
$curr;

public function
__construct () {

$this->count = 0;

}

public function
add ($step) {

$this->count++;
$this->all[$this->count] = $step;

}

public function
setCurrent ($step) {

reset($this->all);
for (
$i=1; $i<=$this->count; $i++) {
if (
$this->all[$i]==$step) break;
next($this->all);
}
$this->curr = current($this->all);

}

public function
getCurrent () {

return
$this->curr;

}

public function
getNext () {

self::setCurrent($this->curr);
return
next($this->all);

}

}
?>

usage example:

<?php
$steps
= new Steps();
$steps->add('one');
$steps->add('two');
$steps->add('three');
$steps->setCurrent('one');
echo
$steps->getCurrent()."<br />";
echo
$steps->getNext()."<br />";
$steps->setCurrent('two');
echo
$steps->getCurrent()."<br />";
echo
$steps->getNext()."<br />";
?>
up
-3
JumpIfBelow
8 years ago
After dealing with the fact that next() will either returns FALSE when there is no further element in the array or if the element itself is FALSE, I finally find a way to do a has_next() method, which will never fails. You can ignore and/or downvote my last comment, this it will be deleted.
Here is the code that work :
<?php
function has_next(array $a){
return
next($a) !== false ?: each($a) !== false;
}
?>
up
-5
tino at infeon dot com
17 years ago
this may be handy and i didnt know where else to post it.. i need a simple function to cycle through an array i eventually made it into a class so i could have multiple cycles.. if you like it or find it usefull please email me and let me know

class Cycle
{
var $position;
var $dataArray;
var $dataArrayCount;

function Cycle()
{
$this->dataArray = func_get_args();
$this->dataArrayCount = count($this->dataArray);
}

function Display()
{
$this->position = (!isset($this->position) || $this->position >= ($this->dataArrayCount - 1)) ? 0 : $this->position += 1;
return $this->dataArray[$this->position];
}

}

$bgColor = new Cycle('#000000', '#FFFFFF', '#FF0000');

echo $bgcolor->Display();
//returns #000000
echo $bgcolor->Display();
//returns #FFFFFF
echo $bgcolor->Display();
//returns #FF0000
echo $bgcolor->Display();
//returns #000000
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