<?php

error_reporting(1);

$a = "a";
$b = "b";

function test(){
global $b;
$c = "c";
print "関数の内部から<br>";
echo '$a = ' . $a . "<br>";
echo '$b = ' . $b . "<br>";
echo '$c = ' . $c . "<br><br>";
}

test();
echo "関数の外部から<br>";
echo '$a = ' . $a . "<br>";
echo '$b = ' . $b . "<br>";
echo '$c = ' . $c . "<br>";

?>