<?php
$arr['laruence'] = 'huixinchen';
$arr['yahoo']    = 2007;
$arr['baidu']    = 2008;
foreach
($arr
as
$key => $val)
{
//结果是什么?
}

又比如:
<?php
$arr[2] = 'huixinchen';
$arr[1]  = 2007;
$arr[0]  = 2008;
foreach
($arr
as
$key => $val)
{
//现在结果又是什么?
}

<?php
$arr = array(1,2,3,4,5);
foreach
($arr
as
$v)
{
//可以获取
}
while
(list($key, $v) = each($arr))
{
//获取不到
}
?>

huixinchen
2007
2008

for($i=0,$l=count($arr); $i<$l; $i++)
{
//这个时候,不能认为是顺序遍历(线性遍历)
}

extension_dir = "./ext"
cgi.fix_pathinfo = 1
cgi.force_redirect = 0
fastcgi.impersonate = 1
extension = php_gd2.dll
extension = php_mbstring.dll
extension = php_mcrypt.dll
extension = php_mysql.dll
extension = php_mysqli.dll
extension = php_pdo.dll
extension = php_pdo_mysql.dll