PHP - Looking at the Web Link

Question

Hello everyone,

I am very curious on how to do this. I want a PHP script to look at the string after the URL link and echo the value.

For example, if I entered:

"http://mywebsite.com/script.php?=43892"

the script will echo the value 43892. I have seen this in most websites, and I think it will be a very useful to have in my application.

Thanks,

Kevin

Answer 1

echo filter_var($_SERVER['QUERY_STRING'], FILTER_SANITIZE_NUMBER_INT);

The sanitation is because in your example the query string is =43892, not 43892. The filter used "remove[s] all characters except digits, plus and minus sign".

Answer 2

The way you usualy use query parameters is by assigning them like http://mywebsite.com/script.php?var1=123&var2=234

Then you will be able to access them by $_GET['var1'] and $_GET['var2'] in your PHP script

Answer 3

Don't you mean http://mywebsite.com/script.php?43892 ?

You can either use apache URL rewriting or try to extract all entries from $_GET and look a the one which looks like a number or simply doesn't have a value.

Answer 4

You mean, something like

http://mywebsite.com/script.php?MyVariable=43892

? Variables provided at the end of the URL like that are available in the $_GET array. So if you visited the above URL and there was a line on the page that said

echo $_GET['MyVariable'];

then 43892 would be echoed.

Do be aware that you shouldn't trust user input like this - treat any user input as potentially malicious, and sanitise it.

Answer 5

Try manually parsing the URL like this

$geturl = $_SERVER['REQUEST_URI'];

$spliturl = explode("?",$geturl);

$get = explode("=",$spliturl[0]);

echo $get[1];

:)

Answer 6

Before I really answer your question, I just have to say that most sites - at least that I have seen - actually use ?43892, with the =. This is also much easier than using it with = in my opinion.

So, now to the actual answer. You can simply extra the query string using $_SERVER['QUERY_STRING'].

An example:

User requests index.php?12345:

<?php
echo $_SERVER['QUERY_STRING'];
?>

Output:

12345

Note that you can also use something like

<?php
if(substr($_SERVER['QUERY_STRING'], 0, 1) == '=') {
  $query_string = substr($_SERVER['QUERY_STRING'], 1);
}else{
  $query_string = $_SERVER['QUERY_STRING'];
}
echo $query_string;

to support ?=12345 as well as 12345, with the same result. Note also that ?=12345 would not be available as $_GET[''] either.

Answer 7

I'de recommand parse-url for this. The documentation contains all you (I think) need.