call_time_pass_reference

Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of [runtime function name](). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in c:\...\www\demo\vant.php on line

PHP.ini在PHP的一些版本中默认allow_call_time_pass_reference为Off 即不允许运行时传递引用变量..
[code]

function func($a)
{
$a = 'test';
}

$xx = '';

func(&$xx); // 默认情况下会有出错提示...

你要么改函数的声明成:

function func(&$a)
{
$a = 'test';
}

$xx = '';

func($xx);

[/code]

或改php.ini中allow_call_time_pass_reference为On

笔者的PHP5的php.ini的allow_call_time_pass_reference默认为on，特意改成off。

PS: 在运行时传递引用不是一个好习惯..

以下是本人的一个练习：
[code]
function func1(&$a)
{
echo '$xx初值为：'.$a.'
';
$a="中国";
}

$xx = '测试';
func1($xx);
echo '最后$xx的值为：'.$xx.'

';
?>
function func2($a)
{
echo '$xx初值为：'.$a.'
';
$a="中国";
}

$xx = '测试';
func2($xx);
echo '最后$xx的值为：'.$xx;

?>

[/code]