Tag: php

PHP stuff

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Still looking for a PHP contractor….

At work I’m still looking for a short term PHP contractor. Perhaps I’m being unrealistic in my expectations/requirements (rate/location/duration/skills etc), but nevertheless…. As I’ve not found anyone via normal channels (twitter/phpwm user group etc) I thought I’d turn to a random recruitment agency (who I’d spoken to a week or so ago).

Yesterday I interviewed one guy – who’d been a programmer for a number of years (10+) – using Visual Foxpro (whatever that is) – presumably it’s a dead language, as he wants to move across into PHP. He has very basic PHP experience (yet claims 2 years on his CV), figured out how to do FizzBuzz and Recursion without too much help – but didn’t know anything about object orientation, separation of concerns (specifically MVC), security (obvious SQL injection) or unit testing and failed to make any comment on what is almost the worst code I could find to present to him. This isn’t necessarily a problem – I would normally be happy to train someone – however, not when I’m paying him £25/hour and I’d be lucky if he was productive within a week. (Hint: students are better than this when they’ve only been in University for two years).

Today, I therefore continued hunting, with mixed success. I had three more CVs – all asking for more money, and one looked quite good – but had a requirement he worked remotely after the first few days (well he does live in Telford). Another, who is local, I’m interviewing tomorrow. Wanting to do some homework on him, I had a look at a couple of websites mentioned in his doctored CV  – the first is clearly .Net from the error message it throws when you pass a > into it’s search box – so either they replaced his PHP site quickly or his CV is misleading. The second has a PHP error on it – and is only (effectively) a themed wordpress site which looks like it’s slowly rotting. From these I found out his address (hint: whois $flamingodomain) and an invalid email address/domain (which archive.org seems to not do much with). Typing in his name into Google / LinkedIn, Facebook etc produces no obvious matches. So I know hardly anything about him, and for all intent he may as well not exist. Great sales job there.

From talking to the recruiters it seems it’s difficult to find decent PHP programmers – and anyone who may be decent will almost certainly not be programming PHP as their primary language (i.e. they’ll be doing web development in Java/.Net, and know PHP quite well). This seems a shame, but really only confirms what I already knew from interacting with others in the community. I’ve known for ages that I’ve effectively taken a large pay cut by running my own company, and doing PHP. It sucks that this continues to be the case. Clearly I’m a martyr or something.

So, if you happen to be a contractor looking for work, please make an effort. I’m not overly impressed so far, and may just end up stalling customers for another week/month instead.

(Oddly I wrote this post, posted it, and it vanished. What are you up to wordpress? Why do you want me to retype things in twice?)

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Random PHP project progress

Initially when we founded Pale Purple all our new PHP development used a combination of Propel, Smarty and some inhouse glue. Over time we seem to have drifted towards the Zend Framework, but I’ve never been particularly happy with Zend_Db or Zend_View. Why the Zend Framework? Well, it has loads of useful components (Cache, Form, Routing, Mail etc) and it’s near enough an industry standard from what we see – and obviously I’d rather build on the shoulders of others than spend time developing an in-house framework no one else will ever use.

For one customer, we’re currently working on the next iteration of their code base – which incorporates a number of significant changes. When we inherited the code base from the previous developers we spent a long time patching various SQL Injection holes (casting to ints), moving over to use PDO’s prepared statements and trying to keep on top of the customer’s new functionality requests and support issues. There’s still a lot of horrible code to refactor, plenty of security holes (although none public facing) and we know we’re moving in the right direction – hopefully patching and duct tape will soon be a thing of the past as it will develop some form of architecture and look like someone has thought about design and long term maintenance.

I’ve started to properly do Test First Development – at least from a support perspective – as too often we’d find we would patch a bug, only for it to reappear again in a few weeks/months time. This has been especially useful with the SOAP interface the application exposes. The tests run every 5 minutes, and we all get emailed when stuff breaks – it took all of 30 minutes to setup and put in place – then it was just a case of actually writing the unit tests themselves (the tests take minutes to write; finding/fixing any bugs they pin point takes somewhat longer :-/ ). I’ve also abused Simpletest’s web testing ‘stuff’ to also act as an availability checker of the live site (i.e. hit a few remote URLs, and check that we don’t get error messages back and do see expected strings).

The original code base had no ‘model’ like layer (or MVC ‘compliance’) – files containing HTML, CSS, SQL, Javascript and PHP were the norm – we’ve added Propel to the project as the ‘model’ layer – which took a few hours; and then when reverse engineering the database we found a few oddities (tables without primary keys and so on) – anyway, moving the functionality from a handful of legacy objects across into the Propel ones seems to be well underway, and I for one will be glad to see the end of :

$x = new Foo(5);

Accompanied with code that does the equivalent of :

class Foo {
    public function __construct($id = false) {
        if($id != false) {
            // select * from foo where id = 5
            // populate $this; don't bother checking for the edge case where $id isn't valid
       }
       else {
           // insert into foo values ('');
          // populate $this->id; leaving all other fields as empty strings...
     }
     public function setBaz($nv) { // repeat for all table fields
         $this->baz = $nv;
         global $db;
         $db->query('update foo set baz = "' . $nv . '" where id = ' . $this->id);
     }
}


Finally, we have a meaningful directory structure – where some things aren’t exposed in the document root. Hopefully soon a front controller and some decent routing. At the moment a huge amount of code is just sat in the ‘public’ directory due to it’s nature. We hope to fix this in time, and move to using Zend Controller – once we get Smarty integrated with it.


Propel has added some nice new features since we last used it (effectively v1.2); it was a toss up between it and Doctrine (as obviously the ZF is moving in that direction) – but we already had knowledge/experience with Propel and it seemed the easier option.


I’m hoping that with time we’ll be able to get up to at least 60% test coverage of the code base – at that point we should be able to refactor the code far easier and with less fear. At the moment I doubt the unit tests cover more than 5-10% – although maybe it’s time I pointed xdebug or whatever at it to generate some meaningful stats.


My final task is to get some decent performance measurements out of the code base – so we can track any performance regressions. I’m fairly confident that moving to Propel will result in an speedup as duplicate object hydrations will be eliminated thanks to it’s instance pool, however having hard figures and nice graphs to point at would be ideal. So far I’ve knocked up my own script around ‘ab’ which stores some figures to a .csv file and uses ezComponents to generate a graph file. This seems to be a crap solution, but I can’t think or find anything better. Any suggestions dear Internet? Perhaps I should integrate changeset/revision id’s in my benchmarking too. Suggestions here would be exceedingly appreciated.


There, I should have ticked all necessary boxes wrt development practices now. Now to work on finding a contract PHP developer….

	


	





		

		
Posted on 
PHP array and object addition and string indexing
	


	
	

		
While reading someone’s code, I came across the following sort of thing:




function foo($config = array()) {


 $this->_config += $config;

//...

}




To which I thought WTF? How does PHP cast an array to a number to perform addition?


A few random tests later, it appears PHP joins the two arrays together, only adding indexes that appear in the second (and not first) array.


(as per php manual – array operators)


Namely :


$array_1 = array(‘a’,’b’, 4=>’c’);

$array_2 = array(4=>’e’, ‘f’, ‘g’);


$array_1 += $array_2;


print_r($array_1);


will give :

Array

(

[0] => a

[1] => b

[4] => c

[5] => f

[6] => g

)


(Note; 4=>e is not in the resultant array, because 4=>c was in array_1).


After a round about conversation with Moobert on this on IRC – at which point he probably put me out of my misery, he also gave me the following :


$x = ‘test’;

echo $x[‘whatever’]; // outputs ‘t’


Which I can understand – as PHP allows for per-character access to a string (based on position) – hence ‘something’ gets casted to zero, and we get the first character back.


I know I can cast objects to arrays, and vice versa.


Seemingly Objects don’t follow any sort of ‘union’ rule however… as adding two objects results in ‘2’. Not sure how PHP converts an object into ‘1’… but there we are. I sort of expected to get an object back (assuming the inputs were the same type) with a union of properties, but no.