Supplement the missing parts of runnable code

[lwlwilliam]

I found that there are not many sample codes for amphp and other library documents under the organization, and there are various problems with the sample codes, some without <?php tags, some without require autoload.chp, and some without use statements. I'm not sure if I need help refining these examples so that they can run directly.

[trowski]

Thanks! Our code snippets could use some love, and this is a good first step.