each

(PHP 4, PHP 5, PHP 7)

each — Return the current key and value pair from an array and advance the array cursor

Увага

Ця функція ЗАСТАРІЛА, починаючи з PHP 7.2.0, та ВИЛУЧЕНА в PHP 8.0.0. Вкрай не рекомендується на неї покладатися.

Опис

each(array|object &$array): array

Return the current key and value pair from an array and advance the array cursor.

After each() has executed, the array cursor will be left on the next element of the array, or past the last element if it hits the end of the array. You have to use reset() if you want to traverse the array again using each.

Параметри

array: The input array.

Значення, що повертаються

Returns the current key and value pair from the array array. This pair is returned in a four-element array, with the keys 0, 1, key, and value. Elements 0 and key contain the key name of the array element, and 1 and value contain the data.

If the internal pointer for the array points past the end of the array contents, each() returns false.

Приклади

Приклад #1 each() examples

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

$bar now contains the following key/value pairs:

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

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

$bar now contains the following key/value pairs:

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

each() is typically used in conjunction with list() to traverse an array, here's an example:

Приклад #2 Traversing an array with each()

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

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

Поданий вище приклад виведе:

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

Застереження

Because assigning an array to another variable resets the original array's pointer, our example above would cause an endless loop had we assigned $fruit to another variable inside the loop.

Увага

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

Прогляньте також

key() - Fetch a key from an array
list() - Assign variables as if they were an array
current() - Return the current element in an array
reset() - Встановлює внутрішній вказівних масиву на його перший елемент
next() - Advance the internal pointer of an array
prev() - Rewind the internal array pointer
foreach
Object Iteration