php - Radio button $_POST -

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how know value of clicked button 

<input type="radio" name="radio">yes<br> <input type="radio" name="radio">no

php part 

$option1= $_post['radio'];

when echo it say's "on".

you need give value attribute:

<input type="radio" name="radio" value="yes">yes<br> <input type="radio" name="radio" value="no">no

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