Php obtains the url and parameters of the current page.

Get protocol-http
The url protocol can be read in the $ _ server ['server _ protocol'] variable.
*/

Echo $ _ server ['server _ protocol'];

/*
If you check the value, you can find that not only http or https, but such a string: http/1.1

*/

$ Protocol = strpos (strtolower ($ _ server ['server _ protocol']), 'https') = false? 'Http': 'https ';

/*
Get host domain name */

$ Host = $ _ server ['http _ host'];

/*
Use $ _ server ['script _ name'] to obtain the php file and path except the domain name

*/

$ Script = $ _ server ['script _ name'];

// Get? Query parameters later

$ Params = $ _ server ['query _ string'];

// Method 2
$ Uri = $ _ server ['request _ uri '];

// The following shows a complete example of getting the current url.

$ Protocol = strpos (strtolower ($ _ server ['server _ protocol']), 'https') = false? 'Http': 'https ';
$ Host = $ _ server ['http _ host'];
$ Script = $ _ server ['script _ name'];
$ Params = $ _ server ['query _ string'];
$ Currenturl = $ protocol. ': //'. $ host. $ script .'? '. $ Params;
Echo $ currenturl;