<?php
	if(isset($_POST['button1']))
	{
		echo "BUTTON1 aaa";
	}
	else if(isset($_POST['button2']))
	{
		echo "Day la button2";
	}
	else
	{
?>
<form action="" method="post">
	<input type="submit" name = "button1" value="button1" />
	<input type="submit" name = "button2" value="Button2" />
</form>
<?php
	}
	?>