I have php 5 set up on my OS X system, and can perform basic PHP functions.

PHP lives in /usr/local/php5. The php.ini file include_path declaration is:

include_path=".:/lib/php:/Users/dramsey/ZendFramework-1.0.1/library/Zend"

...since I have the Zend library in my user directory.

The include path shows up correctly when I execute phpinfo.

However, I'm unable to run any of the Zend tests or samples. All result in a blank page (no HTML) with no indication of what the problem is.

For example, how would I run the amazon-search test? It includes the statement:

require_once 'Zend/Service/Amazon/Query.php';

Hm. Well, my search path is set to the Zend directory, so maybe if I edit it to:

require_once 'Service/Amazon/Query.php';

Nope. Still get a blank page. Any ideas?

Further info: I downloaded the Zend Studio IDE and stepped through the Amazon search example in the debugger. All the HTML was generated and nothing seemed wrong. I could copy the HTML from the debug output window, paste it into an HTML file, and view it in a browser.

But evaluating the page from within a browser results in the same blank page...

OK, I turned on errors so I can see the problems. It's:

Fatal error: require_once() [function.require]: Failed opening required 'Zend/Service/Amazon/Query.php' (include_path='.:/usr/local/php5:~/ZendFramework-1.0.1/library/Zend') in /Users/dramsey/Sites/amazon-search.php on line 6

The thing is, Zend/Service/Amazon/Query.php does exist. Removing the initial "Zend/" from the require_once statement has no effect.

My include path looks correct as best I can tell, but obviously something's wrong.

The problem is in your include_path:
~ is a standard unix users home directory. For you it's /Users/dramsey, but for your web server (e.g. Apache) it would be different. Try include with absolute path or check in your php.ini if include_path is given with ~ or with /Users/dramsey.

...and that was it. Thanks!