PHP Manual: Advance the internal pointer of an array

Description

mixed next(arrayobject &$array)

next behaves like current, with one difference. It advances the internal array pointer one place forward before returning the element value. That means it returns the next array value and advances the internal array pointer by one.

Parameters

array: The array being affected.

Return Values

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

Warning

This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Changelog

Version	Description
8.1.0	Calling this function on objects is deprecated. Either convert the object to an array using get_mangled_object_vars first, or use the methods provided by a class that implements Iterator, such as ArrayIterator, instead.
7.4.0	Instances of SPL classes are now treated like empty objects that have no properties instead of calling the Iterator method with the same name as this function.

Examples

Example #1 Example use of next 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';
?>

Notes

Note: The end of an array is indistinguishable from a bool false element. To properly traverse an array which may contain false elements, see the foreach function. To still use next and properly check if the end of the array has been reached, verify that the key is null.

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