PHP变量的作用范围实例讲解

?php

function test(){
	$a=10;
	echo $a;
}
test();
echo "hr />";
echo $a;
?>

?php
$a=10;
function test(){
	echo $a;
}
test();
echo "hr />";
echo $a;
?>

?php
$a = 10;
function test(){
	global $a;
	echo $a;
}
test();
?>

?php
define("NAME","WCP");
function test(){
	echo NAME;
}
test();
?>

?php
function test(){
	static $a = 0;
	echo ++$a."|";
}
test();
test();
test();
?>