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PHP Functions Online

prev

(PHP 4, PHP 5)

prev — Rewind the internal array pointer

mixed prev(array &$array)

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Description #

mixed prev ( array &$array )

Rewind the internal array pointer.

prev() behaves just like next(), except it rewinds the internal array pointer one place instead of advancing it.

Parameters #

array

The input array.

Return Values #

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

Examples #

Example #1 Example use of prev() 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 #

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.

Note: You won't be able to distinguish the beginning of an array from a boolean FALSE element. To properly traverse an array which may contain FALSE elements, see the each() function.

See Also #

  • Main PHP Function Online page
  • current() - Return the current element in an array
  • end() - Set the internal pointer of an array to its last element
  • next() - Advance the internal array pointer of an array
  • reset() - Set the internal pointer of an array to its first element
  • each() - Return the current key and value pair from an array and advance the array cursor
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