How To Pass Variables By References

Q

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

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A

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:

<?php
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, 4955👍, 0💬

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