PHP $_Server 无法正常工作 [英] PHP $_Server Not Working Properly
问题描述
我有以下几行:
一切都很好,它显示了当前链接,比方说:http://www.example.com/mypage.php
现在我想将它与一个变量相关联
$myURL = 'http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]'
当我回应这个时,我得到http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"——换句话说就是代码本身.我究竟做错了什么?
我也试过:$myURL = '{http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]}'
我也试过直接回显出来:
echo 'http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]';
我忽略了什么?谢谢!
变量在单引号中时不会内插.使用双引号:
$myURL = "http://$_SERVER['HTTP_HOST']$_SERVER['REQUEST_URI']";
或者,为了清楚起见:
$myURL = "http://{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";$myURL = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];$myURL = sprintf("http://%%",$_SERVER['HTTP_HOST],$_SERVER['REQUEST_URI']);
I have the following line:
<div class='social'>http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]</div>
It's all great and it displays the current link, let's say: http://www.example.com/mypage.php
Now I want to associate this with a variable as such
$myURL = 'http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]'
When I echo this out I get "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]" - in other words the code itself. What am I doing wrong?
I've also tried: $myURL = '{http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]}'
I've also tried echoing it out directly:
echo 'http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]';
What am I overlooking? Thank you!
Variables are not interpolated when in single quotes. Use double quotes:
$myURL = "http://$_SERVER['HTTP_HOST']$_SERVER['REQUEST_URI']";
Or, for clarity:
$myURL = "http://{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";
$myURL = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$myURL = sprintf("http://%%",$_SERVER['HTTP_HOST],$_SERVER['REQUEST_URI']);
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