I am trying my first Hello World app using php and xampp. I've been getting errors so far and been working through the problems one by one. So far I have:

Saved the php file ("hello.php") on C:\xampp\htdocs. The following line is in between html "body" tags.
```
<?php echo '<p>Hello World</p>'; ?> 
```
Disabled World Wide Web Services from using port 80 as that caused an error on my xampp control panel.
Disabled mySQL56 from using port 3306 as also caused an error on my xampp control panel. At this point, when I turn on xampp control panel, everything looks fine (I say this because all i can see is blue and black writing) except it says I am not running with admin rights.
When I type in http://localhost/hello.php on either Chrome or Firefox, I get "This webpage is not available." error.

Does anyone know what I am doing wrong?

Further notes: I am using Windows 7 and haven't downloaded anything from PHP.

I apologise for perhaps a too wide question. I have tried to be as specific as possible by outlining all actions I have taken.

Try running control panel with admin rights. Right click on control panel icon and select "Run as administrator". Also it would help if you pasted here the messages that you get in control panel when you start apache (mysql is not needed to run your hello.php file since you don't access any database).

If admin privileges did not work for you, and you are SURE that your firewall or some other app is NOT blocking Apache ... then:

Make sure, you are visiting the same port, that your Apache is listening to...

Basic http://localhost/ is actually requesting port 80
Secure https://localhost/ is requesting port 443

So in Control Panel, check what ports are 'on' for Apache:
Usually the first one of 2 ports is the one you want - if there is 80, use http://localhost/ ,
if there is 443, you would use https://localhost/

...and lastly - if there is NONE of these 2, you need to write your URL like:
http://localhost:PORT_NUMBER

I hope this will help someone :)

I've actually also had quite some issues with XAMPP now, so I bet it's a problem with the software setup. Here are some reasons that could cause your roblem.

Try the local URL http://127.0.0.1/hello.php
Check the XAMPP control panel to see if Apache is running properly
Restart your computer
Run Apache with Administrator privileges
Check the Apache server configuration

Some less probable causes

Make sure no Firewall or other software is blocking the applications, specifically port 80 [e.g., Skype may do that; can be disabled in a menu]. You might want to try out Windows Firewall to try it out ( make sure to reenable it afterwards )
Check the hosts file in C:\Windows\System32\drivers\etc

Alternatively, try connecting to the standard XAMPP page located at the local website roots localhost / 127.0.0.1.

If you have changed the port numbers of Apache when configuring XAMPP,

you have to run the localhost as,

http://localhost:PORT_NUMBER

ex: 89 is the port number.So it can be written as localhost:89

You can find the allocated port number from XAMPP control panel.XAMPP Control Panel

来源：https://stackoverflow.com/questions/28508774/xampp-this-webpage-is-not-available

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