each

(PHP 4, PHP 5, PHP 7)

eachВозвращает текущую пару ключа и значения массива и сдвигает указатель на одну позицию вперёд

Внимание

Эта функция объявлена УСТАРЕВШЕЙ начиная с PHP 7.2.0 и была УДАЛЕНА в версии PHP 8.0.0. Использовать эту функцию крайне не рекомендуется.

Описание

each(array|object &$array): array

Возвращает текущую пару ключа и значения массива и продвигает внутренний указатель массива на одну позицию.

После выполнения функции each() указатель массива останется на следующем элементе или за последним элементом, если указатель достигнет конца массива. Для повторного обхода каждого элемента массива, нужно вызвать функцию reset().

Список параметров

array

Входной массив.

Возвращаемые значения

Возвращает текущую пару ключа и значения массива array. Пара возвращается в массиве из четырёх элементов с ключами 0, 1, key и value. Элементы с ключами 0 и key содержат имя ключа элемента массива, а ключи 1 и value содержат данные.

Если внутренний указатель массива указывает за пределы массива, функция each() вернёт false.

Примеры

Пример #1 Примеры использования функции each()

<?php

$foo
= array("bob", "fred", "jussi", "jouni", "egon", "marliese");
$bar = each($foo);
print_r($bar);

?>

Переменная $bar теперь содержит следующие пары ключей и значений:

Array
(
    [1] => bob
    [value] => bob
    [0] => 0
    [key] => 0
)

<?php

$foo
= array("Robert" => "Bob", "Seppo" => "Sepi");
$bar = each($foo);
print_r($bar);

?>

Переменная $bar теперь содержит следующие пары ключей и значений:

Array
(
    [1] => Bob
    [value] => Bob
    [0] => Robert
    [key] => Robert
)

Функцию each() часто вызывают совместно с функцией list() для обхода массива, как в этом примере:

Пример #2 Обход массива функцией each()

<?php

$fruit
= array('a' => 'apple', 'b' => 'banana', 'c' => 'cranberry');

reset($fruit);
while (list(
$key, $val) = each($fruit)) {
echo
"$key => $val\n";
}

?>

Результат выполнения приведённого примера:

a => apple
b => banana
c => cranberry

Предостережение

Поскольку присвоение массива другой переменной сбрасывает указатель исходного массива, пример выше вызвал бы бесконечный цикл, если бы внутри цикла переменную $fruit присвоили другой переменной.

Внимание

Функция each() также принимает объекты, но иногда возвращает неожиданные результаты. Поэтому перебирать свойства объекта функцией each() не рекомендуют.

Смотрите также

  • key() - Получает ключ массива
  • list() - Присваивает переменным значения похожим на массивы синтаксисом
  • current() - Возвращает текущий элемент массива
  • reset() - Устанавливает внутренний указатель массива на первый элемент
  • next() - Сдвигает внутренний указатель массива на одну позицию вперёд
  • prev() - Сдвигает внутренний указатель массива на одну позицию назад
  • foreach
  • Итерация объектов

add a note

User Contributed Notes 24 notes

up
14
janhsh
1 year ago
Following the obsolescence of the each() function, here is a way to correct your source codes:

If you use each() in a while loop like this:

while (list($Key,$Value)=@each($Array)){
....
}

you have to replace with

foreach ($Array as $Key => $Value){
....
}

In the same minds.

while (list(,$Value)=@each($Array)){
....
}

will become

foreach ($Array as $Value){
....
}
up
41
wolfeym38 at yahoo dot com
17 years ago
Regarding speed of foreach vs while(list) =each
I wrote a benchmark script and the results are that clearly foreach is faster. MUCH faster. Even with huge arrays (especially with huge arrays). I tested with sizes 100,000. 1,000,000 and 10,000,000. To do the test with 10 million i had to set my memory limit real high, it was close to 1gb by the time it actually worked. Anyways,

<?php
function getDiff($start, $end) {
$s = explode(' ', $start);
$stot = $s[1] + $s[0];
$e = explode(' ', $end);
$etot = $e[1] + $e[0];
return
$etot - $stot;
}

$lim=10000000;
$arr = array();
for (
$i=0; $i<$lim; $i++) {
$arr[$i] = $i/2;
}

$start = microtime();
foreach (
$arr as $key=>$val);

$end = microtime();
echo
"time for foreach = " . getDiff($start, $end) . ".\n";

reset($arr);
$start = microtime();
while (list(
$key, $val) = each($arr));
$end = microtime();
echo
"time list each = " . getDiff($start, $end) . ".\n";
?>

here are some of my results: with 1,000,000
time for foreach = 0.0244591236115.
time list each = 0.158002853394.
desktop:/media/sda5/mpwolfe/tests$ php test.php
time for foreach = 0.0245339870453.
time list each = 0.154260158539.
desktop:/media/sda5/mpwolfe/tests$ php test.php
time for foreach = 0.0269000530243.
time list each = 0.157305955887.

then with 10,000,000:
desktop:/media/sda5/mpwolfe/tests$ php test.php
time for foreach = 1.96586894989.
time list each = 14.1371650696.
desktop:/media/sda5/mpwolfe/tests$ php test.php
time for foreach = 2.02504014969.
time list each = 13.7696218491.
desktop:/media/sda5/mpwolfe/tests$ php test.php
time for foreach = 2.0246758461.
time list each = 13.8425710201.

by the way, these results are with php 5.2 i believe, and a linux machine with 3gb of ram and 2.8ghz dual core pentium
up
17
phpcoder at gmail dot com
5 years ago
each was deprecated because it exposed too much of the internal implementation details, blocking language development. ("We can't do X because it would break each().")

https://wiki.php.net/rfc/deprecations_php_7_2#each

If you want an array pointer, maintain it yourself. Probably a good idea anyway, because then it's visible in the code.
up
10
dmikam
3 years ago
This function is marked as deprecated in PHP 7.2.0 and is removed in PHP 8.0.0, the replacement for legacy code would look like this:

function legacy_each($array){
$key = key($array);
$value = current($array);
$each = is_null($key) ? false : [
1 => $value,
'value' => $value,
0 => $key,
'key' => $key,
];
next($array);
return $each;
}
up
7
man13or at hotmail dot fr
4 years ago
Hello, since each() and list() often "betray" very old applications, I simply recommend not to use them anymore.

If you want to assign variables based on an associative array,
Replace this:

while(list ($key, $value) = each ($my_array)) {
$$key = $value;
}

with this:

foreach ($my_array as $key => $value) {
$$key = $value;
}
up
12
sjoerd-php at linuxonly dot nl
18 years ago
Use foreach instead of while, list and each. Foreach is:
- easier to read
- faster
- not influenced by the array pointer, so it does not need reset().

It works like this:
<?php
$arr
= array('foo', 'bar');
foreach (
$arr as $value) {
echo
"The value is $value.";
}

$arr = array('key' => 'value', 'foo' => 'bar');
foreach (
$arr as $key => $value) {
echo
"Key: $key, value: $value";
}
?>
up
2
Henk Poley
5 years ago
Rector has an automated fix ('ListEachRector') to migrate away from `each()`:

https://github.com/rectorphp/rector/blob/master/docs/AllRectorsOverview.md#listeachrector

If you look at the code example you'll see this is even quite simple to do by hand.
up
4
james at gogo dot co dot nz
19 years ago
It's worth noting that references to an array don't have thier own array pointer, and taking a reference to an array doesn't reset it's array pointer, so this works as you would expect it would by eaching the first three items of the array, rather than the first item 3 times.

<?php
$x
= array(1,2,3);

print_r(each($x));
echo
"\n";

$y =& $x;
print_r(each($y));
echo
"\n";

$z =& $y;
print_r(each($z));
echo
"\n";
?>
up
3
Sopinon
19 years ago
If you want to display the hole structure (tree) of your array, then you can use this recursive solution.

<?PHP
$tree
= "";
array_tree($your_array);
echo
$tree;

// Recursive Function
function array_tree($array, $index=0){
global
$tree;
$space="";
for (
$i=0;$i<$index;$i++){
$space .= " ";
}
if(
gettype($array)=="array"){
$index++;
while (list (
$x, $tmp) = each ($array)){
$tree .= $space."$x => $tmp\n";
array_tree($tmp, $index);
}
}
}
?>
up
2
Anonymous
6 years ago
An odd function to deprecate. If you're keeping track of an array pointer in a collection outside a foreach loop you don't care about performance and the utility of this function is core.

Instead you must call two functions: current() and then next() to replicate its behaviour.
up
2
michael k (name der redaktion bekannt.)
17 years ago
If you want to iterate over a two-dimensional, sparse array, and want to first display every first element, then every second and so on, you can use this code:

$fruits = array ( "fruits" => array ( "a" => "orange",
"b" => "banana",
"c" => "apple"
),
"numbers" => array ( 1,
2,
3,
4,
5,
6
),
"holes" => array ( "first",
5 => "second",
"third",
10 => "fourth",
)
);

$done = False;
while ($done == False) {
$done = True;

// Important: &$val has to be a reference (use the &),
// if you don't, the internal counter of $val will be
// re-initialized each time and you loop over the first elements
// for eternity.

foreach($fruits as $key => &$val) {

if (list($inner_key, $inner_val) = each(&$val)) {
$done = False;
echo "$key : : $inner_key => $inner_val <br> \n";
}

}
}

NOTE: this is just a quick hack, if you know a better way, post it!
up
1
wodzuY2k at anronet dot pl
22 years ago
This function will help you dump any variable into XML structure.

//dump var into simple XML structure
function var_dump_xml($tagname,$variable,$level=0)
{
for($i=0;$i<$level;$i++) $marg.=' ';
if (eregi('^[0-9].*$',$tagname)) $tagname='tag_'.$tagname; //XML tag cannot start with [0-9] character
if (is_array($variable))
{
echo $marg."<$tagname>\n";
while (list ($key, $val) = each ($variable)) var_dump_xml($key,$val,$level+1);
echo $marg."</$tagname>\n";
}
elseif (strlen($variable)>0)
{
echo $marg."<$tagname>".htmlspecialchars($variable)."</$tagname>\n";
};
};

/*
example:

$myVar = array("name"=>"Joe", "age"=>"26", "children"=>array("Ann","Michael"));
var_dump_xml("myVarTag",$myVar);
*/
up
1
matthew at mhalls dot net
18 years ago
To panania at 3ringwebs dot com:

If you know for certain that you are only receiving one row, the while becomes redundant. To shorten your code:

$strSQL = "SELECT * FROM table WHERE id=1";
$RecordsetSelect = $db->runQuery ($strSQL);
list($key, $val) = mysql_fetch_row($RecordsetSelect);
echo "$key => $val\n";
mysql_free_result($RecordsetSelect);

With only one row being returned this is more elegant a solution, but just being nit-picky in essence. It also shows another quick way of using list.
up
-1
massimo dot modica at tin dot it
14 years ago
If you forget to reset the array before each(), the same code may give different results with different php versions.

<?php

$a
= array(1,2,3);

foreach (
$a AS $k => $v) $a[$k] = 2*$v;

while(list(
$k2, $v2) = each($a)) { echo($v2."\n"); }

?>

In PHP 5.2.0:

2
4
6

In PHP 5.2.6:

4
6
up
-1
Anonymous
22 years ago
I usually work a lot with 2D arrays. Since I've had some trouble traversing them correctly maybe someone out there also experienced those problems and can use this one.

It's based on a 2D-array called $array[$x][$y]. At some (but not necessarily all) (x,y) there is a value I want to reach. Note that I do not know beforehand the ranges of $x or $y (that is their highest and lowest values).

while (list ($x, $tmp) = each ($array)) {
while (list ($y, $val) = each ($tmp)) {
echo "$x, $y, $val";
}
}

The answer for each (x,y) pair can thus be (providng, of course those values where in your array beforehand):

1, 1, 2
2, 2, 0
3, 1, 1
5, 2, 2
5, 1, 2

Note that only the (x,y) pairs with a corresponding value is shown.

Hang in there
Jon Egil Strand
NTNU
up
-2
amby2 at izh dot com
18 years ago
I've found a compact way to cycle through an associative array using for statement (not while, as it has been done in the most of examples below):

<?php

for (reset($array); list($key) = each($array);) {
echo
$key;
echo
$array[$key];
}

?>

or

<?php

for (reset($array); list($key, $value) = each($array);) {
echo
$key;
echo
$value;
echo
$array[$key];
}

?>

You hardly forget to add reset($array) code line using such construction.
up
-2
tk at turtle-entertainment dot de
23 years ago
Be sure to use the integrated functions "unset();" or "reset();" - many people forget this and wonder about the created output!
up
-2
13975001197 at 163 dot com
6 years ago
In PHP 7.2 we can use foreach() to replace each(), such as:

foreach($array as $key => $value) {
//do something
}
up
-3
Gillis at dancrea dot com
22 years ago
I wrote a short and pretty simple script to search through associative arrays for some value in the values, heres a simplifyed example of it:

<?php

$foo
['bob'] = "bob is ugly";
$foo['bill'] = "bill is rich";
$foo['barbie'] = "barbie is cute";
$search = "rich";

echo
"searching the array foo for $search:<br>";
reset ($foo);
while (list (
$key, $val) = each ($foo)) {
if (
preg_match ("/$search/i", $val)) {
print
"A match was found in $key.<br />";
} else {
print
"A match was not found in $key.<br />";
}
}

?>

will output:
Searching the array foo for rich:
A match was not found in bob
A match was found in bill
A match was not found in barbie
up
-3
php at omit dot ianco dot co dot uk
16 years ago
I wanted to be able to add to an array while looping through it. foreach does not allow this because it is using a secret copy of the array. each makes this possible (tested on PHP 4).
<?php
$shopping_list
= array('oysters', 'caviare');
reset ($shopping_list);
while (list(
$key, $value) = each ($shopping_list)) {
if (
$value == 'oysters') $shopping_list[] = 'champagne';
elseif (
$value == 'champagne') $shopping_list[] = 'ice';
}
print_r($shopping_list);
// Array ( [0] => oysters [1] => caviare [2] => champagne [3] => ice )
?>
up
-5
gaviel
13 years ago
Ok Here's one for iterating multidimensional array .. using foreach

<?php
$members
= array(
"member1" => array (
"First Name" => "Robert",
"Last Name" => "Burton",
"Age" => "20"
),
"member2" => array (
"First Name" => "Cheska",
"Last Name" => "Vladesk",
"Age" => "21"
),
"member3" => array (
"First Name" => "Gino",
"Last Name" => "Marley",
"Age" => "19"
),
"member4" => array (
"First Name" => "Jake",
"Last Name" => "White",
"Age" => "16"
),
);
$dataSetCount = count($members);
echo
"<h1>There are $dataSetCount members</h1>";

$i = 0;
foreach (
$members as $each_members) {
$i++;
echo
"<h2>Member $i</h2>";
foreach (
$each_members as $position => $details) {
echo
"<b>$position</b>" . ": " . $details . "<br />";
}
}
?>
up
-4
kris at angelanthony dot com
23 years ago
Remember to use "reset()" if you iterate over an array with "each()" more than once! Example:

while(list($key,$value) = each($array)){
// code here
}

NOW the internal pointer on $array is at the end of the array, and another attempt at an iteration like the one above will result in zero executions of the code within the "while" block. You MUST call "reset($array)" to reset the internal array pointer before iterating over the array again from the first element.
up
-5
nino dot skopac at gmail dot com
9 years ago
<?php
function each_v2($arr) {
// same as each() but when it hits end of array, it resets it
static $i = 0;

if (isset(
$arr[$i])) {
// exists¸
return $arr[$i++];
} else {
// reset $i to 0 and repeat
$i = 0;
return
each_v2($arr);
}
}
?>
up
-5
ayyappan dot ashok at gmail dot com
8 years ago
/* Iterating using objects via each */

class SAI
{
public function __toString()
{
return __CLASS__;
}
}
$a = new SAI();
$b = new SAI();
$c = new SAI();
$d = new SAI();
$e = new SAI();

$objarray = array($a,$b,$c,$d,$e);
reset($objarray);
while (list($key, $val) = each($objarray))
{
echo "$key => $val\n";
}
//Results
0 => SAI
1 => SAI
2 => SAI
3 => SAI
4 => SAI

Warning:
each() will also accept objects, but may return unexpected results. It's therefore not recommended to iterate though object properties with each().
To Top