Defining an Argument as a Reference in PHP

Q

Can You Define an Argument as a Reference Type? in PHP?

✍: FYIcenter.com

A

You can define an argument as a reference type in the function definition. This will automatically convert the calling arguments into references. Here is a PHP script on how to define an argument as a reference type:

<?php
function ref_swap(&$a, &$b) {
  $t = $a; 
  $a = $b;
  $b = $t;
}
$x = "PHP";
$y = "JSP";
print("Before swapping: $x, $y\n");
ref_swap($x, $y);
print("After swapping: $x, $y\n");
?>

This script will print:

Before swapping: PHP, JSP
After swapping: JSP, PHP

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