How To Pass Variables By References


How To Pass Variables By References? - PHP Script Tips - Creating Your Own Functions



You can pass a variable by reference to a function by taking the reference of the original variable, and passing that reference as the calling argument. Here is a PHP script on how to use pass variables by references:

function swap($a, $b) {
  $t = $a; 
  $a = $b;
  $b = $t;
$x = "PHP";
$y = "JSP";
print("Before swapping: $x, $y\n");
swap(&$x, &$y);
print("After swapping: $x, $y\n");

This script will print:

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

As you can see, the function modified the original variable.

Note that call-time pass-by-reference has been deprecated. You need to define arguments as references. See next tip for details.

2007-04-24, 4555👍, 0💬