pos
// example of backward iteration
$ar = array ( 'a', 'b', 'c', 'd', 'e', 'f') ;
print_r($ar);
end($ar);
while($val = current($ar)) {
echo $val.' ';
prev($ar);
}
prev
(PHP 4, PHP 5)
prev — Rewind the internal array pointer
Description
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, such as 0 or "". 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.
add a note
User Contributed Notesprev
xmlich02 at stud dot fit dot vutbr dot cz
30-Sep-2007 03:19
30-Sep-2007 03:19