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Three problems in your code

1.The position variable from the unction parameter is not used. You are instead using transform.position which means that the starting point may be wrong.

Replace all your transform.position with position.

2.You are performing the raycast backwards. It should not be transform.position - target. That should be target - transform.position.

3.Your Physics.BoxCastAll will not work properly since there is no ending to the raycast. Objects behind the starting will be detected by the raycast. Now, if you fix problem #2, the problem will reverse. Now, all the objects in behind the target will also be detected since you did not provide the raycast distance. You can provide the distance with Vector3.Distance(position, target) in the last parameter of the Physics.BoxCastAll function.

Fixed function:

I mentioned in the comments that a Javascript typeahead library might be a good choice for you. I've found Twitter's Typeahead library and Bloodhound engine to be pretty robust. Unfortunately, the documentation is a mixed bag: so long as what you need is very similar to their examples, you're golden, but certain details (explanations of the tokenizers, for example) are missing.

In one of the several questions re Typeahead here on Stack Overflow, @JensAKoch says:

To be honest, I think twitter gave up on typeahead.js. We look at 13000 stars, a full bugtracker with no maintainer and a broken software, last release 2015. I think that speaks for itself, or not? ... So, try one of the forks: github.com/corejavascript/typeahead.js

Frankly, in a brief check, the documentation at the fork looks a bit better, if nothing else. You may wish to check it out.

All of the caveats of using an old version of PHP apply. I highly recommend retooling to use PDO with PHP 5, but this example uses PHP 4 as requested.

Completely untested PHP code. json_encode() would be better, but it doesn't appear until PHP 5. Your endpoint would be something like: