Passing Argument by Refrence
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Passing Argument by Refrence

Ampersand (&) in PHP is used to allow two variable to refer the same content. If we use $x = &$y, it means $x will point to $y's content but it is not $y.
 

By using Passing by reference two variable can point to the same content.

Let's see below example-

<?php
$X = 5;
$Y = &$X; // $Y references the same value as $X, currently 1
$Y = $Y + 4; // 5 is added to $Y, which effects $X the same way
echo "Y is equal to $Y and X is equal to $X.";
?>

Output:

Y is equal to 9 and X is equal to 9.

 

 

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