Summary of how to use php to obtain page parameters

javascriptImplementation:
top.location.href The address of the top-level window
this.location.href The address of the current window

PHP implementation

Test URL: http://localhost/blog/testurl.php?id=5

//Get the domain name or host address
echo $_SERVER['HTTP_HOST']."
Output localhost

//Get the web page address
echo $_SERVER['PHP_SELF']."
Output /blog/testurl. php

//Get the URL parameters
echo $_SERVER["QUERY_STRING"]."
Output id=5

//Get the user agent
echo $_SERVER['HTTP_REFERER']."

//Get the complete url
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI' ];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
Output http://localhost /blog/testurl.php?id=5

//Complete url including port number
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER[ "SERVER_PORT"].$_SERVER["REQUEST_URI"];
Output http://localhost:80/blog/testurl.php?id=5

//Only take the path
$url ='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url);
Output http://localhost/ blog

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