How to pass JavaScript variables to PHP

&lt;script&gt;
   var res = "success";
&lt;/script&gt;
&lt;?php
   echo "&lt;script&gt;document.writeln(res);&lt;/script&gt;";
?&gt;

&lt;script&gt;
var p1 = "success";
&lt;/script&gt;

&lt;?php
echo "&lt;script&gt;document.writeln(p1);&lt;/script&gt;";
?&gt;

Submit

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