Demonstrate PHP's function scoping.

scoping_demo.php

<pre>
<?php
	$x = 'value set in global scope';
	
	function namedFunction() {
		echo 'in '.__FUNCTION__.', before setting $x: $x === '.var_export($x, true)."\n";
		$x = 'value set in '.__FUNCTION__;
		echo 'in '.__FUNCTION__.', after setting $x: $x === '.var_export($x, true)."\n";
	}
	
	$anonymousFunction = function() {
		echo 'in '.__FUNCTION__.', before setting $x: $x === '.var_export($x, true)."\n";
		$x = 'value set in '.__FUNCTION__;
		echo 'in '.__FUNCTION__.', after setting $x: $x === '.var_export($x, true)."\n";
	};
	
	echo 'in global scope, before calling functions: $x === '.var_export($x, true)."\n";
	
	echo 'calling namedFunction()...'."\n";
	namedFunction();
	
	echo 'calling $anonymousFunction()...'."\n";
	$anonymousFunction();
	
	echo 'in global scope, after calling functions: $x === '.var_export($x, true)."\n";
?>
</pre>