If you are learning php or using php
This post will help you if you are learning php or already you are a php developer. When you are learning php, you have to practice the functions of the language. If you are stuck with installing a local wamp server or mamp server then you can make use of this online php editor phpkiss.com
You can directly run small php programs in this online website. There are also some sample programs given in this section called PHP Functions . Like finding the ip address of the visitor, generating a four digit random number, generate a strong password, etc.,
Try it out !
Here is a video on how to run php online