All big companies work in PHP. It is a growing technology.....
This is a very broad question, many web design companies will make sites in PHP. Facebook for instance is made in PHP, although the have modified it a bit for their massive traffic!
There are many companies that are offering programming jobs in PHP. Chances are if you check Monster.com you can find exactly what you are looking for.
almost all the IT companies.....but it has a huge scope for future......
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vBulletin is a professional php forum software. It's used by many companies for their online community, but you are required to buy it.
Many jobs can use PHP, a lot of gaming companies around the United States are looking for PHP programmers. Zynga may or may not still be looking for it, and Facebook as well.
Many companies offer PHP web hosting. These do not require a subscription plan. These can vary in cost.
Working with PHP & Flex requires more guidance than we can give here. I would check out their tutorials. wikidocs.adobe.com/wiki/display/Flex/Flex+and+PHP
To run PHP scripts you need a working WWW server (for instance Apache or nginx), with installed and compiled PHP sources (in Windows environment you can use binaries, there is no need to compile).
Now a days most of the companies are getting php development technology to develop their websites.But php is still not a very secure language compare to others like java and dot net. Need more assistant visit : glitzymedia.com/web-development-services/
After you have uploaded it to your web host just go to the page in your browser and then you will see if it is working or not.