php中局部变量和全局变量_PHP教程

$a = 5;

function funcChangeValue()

{

global $a;

$a = 10;

}

funcChangeValue();

echo $a;

?>

output

10

$GLOBALS['a'] = 5;

function funcChangeValue()

{

$GLOBALS['a'] = 10;

}

funcChangeValue();

echo $GLOBALS['a'];

?>

Output

10