Getting the first or last item from an array in PHP is usually quite easy. If you create an array and then add a bunch of values to it then the array index will increment by 1 for every element you add. This means that in order to get the first element from an array you just reference the default starting position (0). To get the last item in the array the index key will be the length of the array, minus 1. Here is some example code showing this.
Alternative PHP Cache (APC) is an opcode and variable cache for PHP. When you run a PHP script it is first compiled into a series of opcodes which are then used by the Zend engine to run the program before being discarded. APC sits between the source files and the Zend engine and will stop the opcodes generated during the PHP script execution being thrown away. This means that when you run a PHP script a second time the work done in generating the opcodes has already been done and the script will execute faster.
I recently have started looking into making myself a PHP Zend Certified Engineer and after doing a bit of research I found that the standard PHP string and array functions appear to be a large part of the exam material. So as a starting point (and for future revision) I decided it might be a good idea to create a revision sheet for those functions.
Ever sat there and pondered which browsers support what css styles? If so I’d like to quickly introduce http://www.caniuse.com. This is a great tool and sometimes the quickest way to find answers to your questions. But what about W3Schools; I hear you say. W3Schools does have a comprehensive list of styles, complete with examples of how to use them and a list of properties that you can use. However, what I find W3Schools fails on is a comprehensive outline of browser support.
The DateTime classes in PHP have been available since version 5.2, but I have largely ignored them until recently. This was partly due to the fact that I was working in PHP 5.1 environments a lot (don't ask) but mostly because I was just used to using the standard date functions that have always been a part of PHP (well, since version 4). I wanted to explain why I will be using the new DateTime classes more from now on and why you shouldn't be hesitant to use them.
Using a combination of strtotime() and date() can handle most things and is a good method to quickly grab a date.
I often find that after recreating a Drupal site locally to do some testing that I have left CSS and JS aggregation turned on. This can be turned off easily enough via the performance page, but this often breaks the flow of what I am doing. As an alternative I use Drush to reset the values via the command line.
The tar command can be used to compress or extract one or more files in Linux. A tar file isn't actually a compressed format, instead it is a collection of files within a single file. The tar command can take one or more files, convert them into a tar file and then compress it into a gzip file format. The file created will have the extension tar.gz.
There are a large number of flags that can be used but the main ones for everyday use are.
To verify that an element exists in the DOM you just need to use the .length property of a jQuery lookup. If the element is there then the number of elements found will be greater than 0.
Organic Groups (OG) in Drupal 7 has a role based permission system that works on a group by group basis. This permissions system works separately to the main Drupal permission system, which can cause a couple of issues. For example, if you want to give a group role access to give other users roles then you'll need to give them the 'Administer groups' permission. The downside of this is that it overrides Drupal's core permissions to do with node deletion and allows the role to delete the group.