In PHP, use &$ in function parameter to pass reference parameters.
Example
The PHP code is as follows
<!DOCTYPE html> <html> <body> <?php function referenceDemo(&$number){ $number=$number+100; return $number; } $number=900; echo "The actual value is=",$number,"<br>"; $result=referenceDemo($number); echo "The modified value is=",$result; ?> </body> </html>
Output
This will produce the following output
The actual value is=900 The modified value is=1000