we can get or post a value of input type="submit" like 

// html
<form method="post">
<input type="submit" name="send" value="send now" />

// php
if(isset($_POST['send'])) echo $_POST['send'];
//result is -> send now

if we replace the input type of above example, like :

<input type="image" name="send" src="button.png" />

then result will be empty

The reason is :
An element which input type="image" specifies as image resource to display. And there are two values of x and y (send_x and send_y) w...

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