获取访问者IP地址的脚本不起作用

Question

I am manually storing the below line in mysql database using php myadmin.

<div>IP address : '<?php echo $_SERVER['REMOTE_ADDR']?>'</div>

It gets updated as I have confirmed it is in database. My php page fetches this from database and updates the html.

The output that I get is -
IP address :

I am not an expert in php. Also I cannot write <?php echo $_SERVER['REMOTE_ADDR']?> directly into my php page. Please help and tell me where is wrong.

Answer 1

When you fetch the text from the DB and output it to the client, it will just be WRITTEN, not EXECUTED - so

$_SERVER['REMOTE_ADDR']

will never be replaced by the real IP adsress.

A solution would be to store

<div>IP address : '%s'</div> 

in your DB, later fetch it and

echo sprintf($txtfromdb,$_SERVER['REMOTE_ADDR'])

to your client.

Answer 2

You shouldn't store the Variables name as such in the database. Because the content of them won't be saved, only its name.

If you want the current clients IP to be shown you could (as for every php content to execute) eval it.

ob_start();
eval( $the_table_content );
$the_content = ob_get_clean();

Now your right content is stored in $the_content and can for example be output by echo $the_content

But if you only want to output it, you don't need the above code and could try just eval( $the_table_content ) instead of echo $the_table_content

A better solution is generally Eugen Riecks but in a few cases this is the fastest and easiest.