PHP prev() Function

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

Syntax

prev(array)

Parameters

array Required. Specify the input array.

Return Value

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

Note: This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Therefore, use === operator for testing the return value of this function.

Exceptions

NA.

Example:

The example below shows the usage of prev() function.

<?php
$Arr = array(10, 20, "Hello", "World");

echo current($Arr)."\n";   //prints 10
echo next($Arr)."\n";      //prints 20
echo prev($Arr)."\n";      //prints 10
echo end($Arr)."\n";       //prints World
echo prev($Arr)."\n";      //prints Hello

echo "\n";
$Arr1 = array();
var_dump(prev($Arr1));     //bool(false)

$Arr2 = array(array());
var_dump(prev($Arr2));     //bool(false)
?>

The output of the above code will be:

10
20
10
World
Hello

bool(false)
bool(false)

Example:

Consider one more example where the prev() function is used with an associative array.

<?php
$Arr = array(10=>"Red",
             20=>"Green",
             30=>"Blue",
             40=>"Black",
             50=>"White");

echo current($Arr)."\n";   //prints Red
echo next($Arr)."\n";      //prints Green
echo prev($Arr)."\n";      //prints Red
echo end($Arr)."\n";       //prints White
echo prev($Arr)."\n";      //prints Black
?>

The output of the above code will be:

Red
Green
Red
White
Black

❮ PHP Array Reference