Clickatell is a popular SMS gateway. It works in 200+ countries.
Their API offers a choice of connection options via: HTTP/S, SMPP, SMTP, FTP, XML, SOAP. Any of these options can be used from php.
The HTTP/S method is as simple as this:
http://api.clickatell.com/http/sendmsg?to=NUMBER&msg=Message+Body+Here (Clickatell API Guide)
The SMTP method consists of sending a plain-text e-mail to:
firstname.lastname@example.org, with the following body:
user: xxxxx password: xxxxx api_id: xxxxx to: 448311234567 text: Meet me at home
You can also test the gateway (incoming and outgoing) for free from your browser: "Test SMS Gateway".
PHP by itself has no SMS module or functions and doesn't allow you to send SMS.
SMS ( Short Messaging System) is a GSM technology an you need a GSM provider that will provide this service for you and may have an PHP API implementation for it.
Usually people in telecom business use Asterisk to handle calls and sms programming.