Right to help clarify things and help people to better understand I am going to write a short tutorial here on how to send an SMS from your site using PHP to secure the SMS form, and using
Clickatell (UK users visit
Clickatell UK) as your SMS gateway.
Sending an SMS from your site will require you to sign up to Clickatell and purchase credits from them. The credits system is easy to understand, you are charged a certain amount of credits per SMS sent, currently purchasing 1-9999 credits will cost 1-1.5 credits per SMS depending on what network you are sending to which is around GBP0.027p per SMS. Once you have signed up for your account with them (it's free) then you will have 10 test SMS.
Next we will create the html form which will send our SMS and the secure login form to prevent those without the password from sending an SMS. The password to send an SMS will be the same as the password you use to login to Clickatell.
Here is the PHP and HTML code for you to copy and paste.
<?php
session_start();
$configusername = 'USERNAME';
$configpassword = 'PASSWORD';
$configapiid = 'API ID';
if (isset($_GET['logout'])){
unset($_SESSION['usesms']);
}
if (isset($_POST['name']) && isset($_POST['pass']) && ($_POST['name'] == $configusername) && ($_POST['pass'] == $configpassword)){
$_SESSION['usesms'] = true;
}
if (isset($_SESSION['usesms']) && ($_SESSION['usesms'] == true)){
?>
<form action="http://api.clickatell.com/http/sendmsg" method="post" name="sendsms">
<table width="600" border="0" align="center" cellpadding="5" cellspacing="0" bgcolor="#999999" style="border:1px solid #000000;">
<tr>
<td colspan="2" align="center" valign="middle"><strong>Send SMS</strong> </td>
</tr>
<tr>
<td align="right" valign="middle">Mobile Number</td>
<td align="left" valign="middle"><input name="to" type="text" /></td>
</tr>
<tr>
<td colspan="2" align="center" valign="middle"><textarea name="text" cols="60" rows="3" id="text" style="width: 100%;"></textarea></td>
</tr>
<tr>
<td colspan="2" align="center" valign="middle"><input name="sendtext" type="submit" id="sendtext" value="Send SMS" /> <input name="logout" type="button" id="logout" value="Logout" onClick="document.location='<?php echo "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']; ?>?logout=true';" />
<input name="user" type="hidden" value="<?php echo $configusername; ?>" />
<input name="password" type="hidden" value="<?php echo $configpassword; ?>" />
<input name="api_id" type="hidden" value="<?php echo $configapiid; ?>" /></td>
</tr>
</table>
</form>
<?php
}
else {
?>
<form action="" method="post" name="login">
<table width="600" border="0" align="center" cellpadding="5" cellspacing="0" bgcolor="#999999" style="border:1px solid #000000;">
<tr>
<td align="center" valign="middle"><strong>Login</strong> </td>
</tr>
<tr>
<td align="center" valign="middle">Username
<input name="name" type="text" /></td>
</tr>
<tr>
<td align="center" valign="middle">Password
<input name="pass" type="password" /></td>
</tr>
<tr>
<td align="center" valign="middle"><input name="login" type="submit" id="login" value="Login" /> </tr>
</table>
</form>
<?php
}
?> So first of all we start the session. This is essential because we will be storing a variable in the session which tells our page that we have logged in succesfully and are authorised to send SMS from this site.
Now we have three different variables that need setting, $configusername, $configpassword and $configapiid. Change the text between the two speechmarks ' ' to your Clickatell username and password. You can get the API key from the API settings page when logged in to your account on Clickatell. The username and password you enter here is also the username and password required to login to this script and send SMS.
Next up we have two IF statements. These test to see if the user has either tried to login or is logging out. If the logout variable has been set by clicking the logout button, this creates a $_GET variable which we test to see if it is set. If it is we unset() the $_SESSION variable that tells our script we are logged in. Unsetting this variable now means our script will read us as not logged in and take us to the login screen. The second IF statement checks that we have entered both a username and password in the login screen and submitted the form, and also verifies the username and password is the same as those entered in the $configusername and $configvariables defined on lines 3 and 4. If they do match, we create a variable in the session called $_SESSION['usesms'] and set the value to true. This now means with this session variable set, when ever we visit this page it will take us to the send sms page, at least until we either logout or the session variable expires.
Now we can start with our html. Before this we need to know which page we are going to display, is the user logged in or not? so the IF statement tests for the existence of $_SESSION['usesms'] and if it finds it, we can display the html for the send sms page, ELSE we display the login page. So the send sms form has an action which is set to
http://api.clickatell.com/http/sendmsg, this is where Clickatell has told us to send all API requests. So the information we submit on this page will be sent to this address and processed by Clickatell.
The key form elements are list below and what information is contained within each one. These are some editable elements and others are hidden elements containing values with ESSENTIAL element names.
- "to" - This is the mobile number you are sending this message to. Don't forget to include the area code
- "text" - The message you are sending. If this is over 160 characters in length, it will send as multiple messages and cost more.
- "user" - Here we echo the $configusername variable with our Clickatell username.
- "password" - Here we echo the $configpassword variable with our Clickatell password
- "api_id" - And again, echo the $configapiid variable with our Clickatell API ID.
These are the variables that Clickatell will pick up and process. We have all the essential information we need, it should all be ready to go. You can now upload your script to your web host or local server (remember, it needs to have PHP support) and try out one of your free test messages to your own mobile phone. The test message will be processed the same as any other message however it will not forward the message body and will instead be along the lines of "This is a test message sent from the Clickatell server".
So that is how you can send SMS messages from a web page. Be careful not to let your username and password fall in to other peoples hands otherwise they could spend all your Clickatell credits.
Clickatell also provides you with incoming SMS messages as well, and I think they allow you to make a profit from them if you choose to charge for incoming messages. If incoming messages are enabled on your account, there is a way to extract the data and display them on your own web page as well, but since I have never meddled in that side of Clickatell I haven't written any scripts for this feature sorry.
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