How to obtain the parameters following '/'

How do I obtain the parameters following? View the Pat product url: '/' is followed by the product parameter. how can I get it? Js, php can, thank you http://auction1.paipai.com/2A8B5E1F00000000002A3AD20787D992? PTAG = 40042.2. how do I obtain the parameters following?
View the Pat product url: '/' is followed by the product parameter. how can I get it? Both js and php are supported. thank you.
Http://auction1.paipai.com/2A8B5E1F00000000002A3AD20787D992? PTAG = 40042.2.7
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$ _ SERVER ['query _ string']; // Obtain parameters
$ _ SERVER ['php _ SELF ']; // Obtain the URL

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Reference:

PHP code? 123 $ _ SERVER ['query _ string']; // Obtain the parameter $ _ SERVER ['php _ SELF ']; // Obtain the URL

This is acceptable. In addition, $ _ SERVER ['request _ URI '] can obtain all
You can view some information in print_r ($ _ SERVER );
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Is the url address known?
If it is known
Strrchr functions can be used.
Strrchr ($ url ,'/');