PHP question mark

PHP question mark "pass value" page & nbsp; & lt; ahref = & quot; syodo. php? Action = add_py & amp; py = & lt ;? = $ V [& quot; userName & quot;]? & Gt; & quot; & gt; add friends & lt;/a & gt; accept page $ py =$ _ POST [& quot; py & PHP question mark passing
Value Transfer page


"> Add friends


Accept page


$ Py = $ _ POST ["py"];


Why can't I receive the value of py? Please kindly advise and wait ..................

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$ Py = $ _ GET ["py"];
Or
$ Py = $ _ REQUEST ["py"];
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The main idea is to pass through the GET method. It should be $ _ GET ["py"]
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GET should be used to pass url values
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Upstairs is.
1. use the get method to pass the value of a url. use $ _ GET to get the value.
2. if the special characters are not escaped and can be passed successfully, try lz.