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What will be the output of the following PHP script:

<?php
function modifyArray (&$array) 
{
    foreach ($array as &$value)
    {
         $value = $value + 2; 
    } 
    $value = $value + 3; 
 } 
$array = array (1, 2, 3); 
modifyArray($array); 
print_r($array);
?>

Array ( [0] => 5 [1] => 7 [2] => 9 )

Array ( [0] => 3 [1] => 4 [2] => 8 )

Array ( [0] => 2 [1] => 4 [2] => 6 )

Array ( [0] => 1 [1] => 2 [2] => 3 )

Explanation:
The foreach loop is used to iterate over the entire array from start to finish. There are two forms of the foreach loop, which are as follows:

foreach (array_expression as $value)
{
 //Statement;
}

foreach (array_expression as $key => $value)
{
 //Statement;
}

In the first form, foreach loop iterates over the array that is given by array_expression. On each iteration, the value of the current element is assigned to $value and the internal array pointer increases by one.

where, in the second form of the foreach loop, on each iteration, the value of the current element is assigned to $value. Also, the current element's key will be assigned to the variable $key on each iteration and the internal array pointer increases by one. The comments explain the working of the PHP script:

<?php
function modifyArray (&$array) 
{
 foreach ($array as &$value) 
 {
 $value = $value + 2; //Increment each value by 2 
 } 
 $value = $value + 3; //It will increment only last value of the array
 }
$array = array (1, 2, 3); 
modifyArray($array); 
print_r($array);
?>

Reference: http://in.php.net/manual/en/control-structures.foreach.php