PHP: Defining A Function

By Xah Lee. Date: . Last updated: .

Define a Function

A function is defined using keyword function. Like this:

<?php
function ff($x,$y) {
  return($x+$y);
}

echo ff(3,4);
# 7
?>

Optional Parameters

<?php
/* ff($x,$y) returns x + y. If $y is not given, default to 1. */
function ff($x,$y=1) {
  return($x+$y);
}

echo ff(3);
# 4
?>