PHP - Ampersand before the variable in foreach loop [duplicate]

Question

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Reference - What does this symbol mean in PHP?

I need to know why we use ampersand before the variable in foreach loop

foreach ($wishdets as $wishes => &$wishesarray) {     foreach ($wishesarray as $categories => &$categoriesarray) {      } } 

Answer 1

This example will show you the difference

$array = array(1, 2); foreach ($array as $value) {     $value++; } print_r($array); // 1, 2 because we iterated over copy of value  foreach ($array as &$value) {     $value++; } print_r($array); // 2, 3 because we iterated over references to actual values of array 

Check out the PHP docs for this here: http://pl.php.net/manual/en/control-structures.foreach.php