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Name

prev — Moves the internal array pointer to the previous element and returns that element's value.

Synopsis

mixed prev(array); array array: Array for which to rewind the pointer

Returns

Contents of the previous element in the array; FALSE when there are no more elements

Description

This function moves the internal array pointer to the previous element of array and returns that element's value. This can be useful with current() and next() to traverse an array; however, this is dangerous. The reason is that prev() returns the value of the element found; if this evaluates to FALSE, there is no way to tell whether you've actually hit the beginning of the array being traversed, or the previous element simply has a value of FALSE.

Version

PHP 3, PHP 4

Example

Example 54. Move the internal array pointer back one element

$my_array = array('a', 'b', 'c', 'd', 'e');
echo end($my_array);
for ($i = 0; $i <= count($my_array); $i++) {
   echo "\n" . prev($my_array);
}

Output:
e
d
c
b
a

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.