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Is there any way to call a php function from HTML button?

<? echo "foo " . somefunc("bar") . " baz"; ?> why dont we need semicolon after that function? if i put semicolon it doesnt work and gives me error.

Hello have you ever faced getting results on example.com/index.php/index.php If yes how did you ,how did you guys solve it?

Is there a WordPress functions dictionary.. which is easy to understand ..?

Is that possible ? Can we auto logout after the function?