PHP

Creating Conditional Functions

Functions declared inside conditional statements, such as if statements, cannot be called until the conditional statements are executed.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
if ($any_fruits)
{
  function fruits($type)
  {
 	 echo "We serve $type for dinner.<br />";
  }
}

if ($any_fruits)
{
	fruits(grapes);
}
?>
</p>
</body>
</html>

View the effect

The condition needs to be true first to execute the function.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
$any_fruits=true;

if ($any_fruits)
{
  function fruits($type)
  {
 	 echo "We serve $type for dinner.<br />";
  }
}

if ($any_fruits)
{
	fruits(grapes);
}
?>
</p>
</body>
</html>

View the effect