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<!DOCTYPE html> <html lang="en"> <head> <title>PHP Passing Arguments by Reference</title> </head> <body> <?php /* Defining a function that multiply a number by itself and return the new value */ function selfMultiply(&$number){ $number *= $number; return $number; } $mynum = 5; echo $mynum . "<br>"; // Outputs: 5 selfMultiply($mynum); echo $mynum . "<br>"; // Outputs: 25 ?> </body> </html>
