what is the php form code of following form code to run this form?

[Cheapnbesttravel]

please let me know what is the php code of this form
<form id="form1" name="form1" method="post" action="">
<p>Name :
<label>
<input type="text" name="textfield" id="textfield" />
</label>
</p>
<p>Email :
<label>
<input type="text" name="textfield2" id="textfield2" />
</label>
</p>
<p>Phone :
<label>
<input type="text" name="textfield3" id="textfield3" />
</label>
</p>
<p>Tour Deatil :
<label>
<textarea name="textarea" id="textarea" cols="45" rows="5"></textarea>
</label>
</p>
</form>