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Shuffle An Array In PHP

24th January 2008 - 3 minutes read time

To randomise an array in PHP use the shuffle() function like this.

  1. $array = range(1, 5);
  2. shuffle($array); // randomise array

There are two limitations to this function. The first is that it completely removes any key association that you may have set up. So the following array.

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Downloading Alexa Data With PHP

23rd January 2008 - 3 minutes read time

It is widely known that the data that Alexa offers on visitor numbers is far from accurate, but it is possible to obtain an XML feed from Alexa that allows you to find out all of the data that Alexa offers, which is more than just their visitor numbers. Passing the correct parameters to this feed you can find out related links, contact and domain information, the Alexa rank, associated keywords and Dmoz listings.

As an example here is a feed URL for getting information about the page.

So to get information about any site all you have to do is pass the correct URL to this address.

To get this information in a usable form with PHP you can use the curl functions. To download the Alexa feed into PHP use the following code:

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Extend The str_word_count Function In PHP

22nd January 2008 - 5 minutes read time

The str_word_count() function in PHP does exactly what is says it does. The default of this function is to simply count the number of words present. Take the following string.

$str = "This is a 'string' containing m0re than one word. This is a 'string' containing m0re than one word.";

If we pass this to the str_word_count() function with no other parameters we get the number of words.

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Setting Up LDAP With Active Directory On Apache

21st January 2008 - 4 minutes read time

Using a simple .htpasswd to password protect a directory or website is fine if you only have a few users, and they don't change very much. However, this quickly becomes impossible to maintain if you have lots of users. For example, if you wanted to secure access to the company Intranet you might spend quite some time trying to update your .htpasswd file. The best way to do this is to transfer all of the user administration over to an LDAP server and then get Apache to communicate with this directly. The Active Directory (AD) system that Microsoft uses allows LDAP communications, and as this is in use across many company networks it is an ideal candidate to use.

You first need to set of the LDAP modules on your Apache server. Uncomment or add the following lines in your http.conf file. You will need to make sure that the files actually exist as well.

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Alternate If Statements In PHP

20th January 2008 - 3 minutes read time

If you have programmed in PHP for any amount of time then you will be farmiliar with the if statement. The syntax is as follows:

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Aborting Connections In PHP

19th January 2008 - 2 minutes read time

Sometimes in PHP you will have to do some things that might take a little time. You will therefore have a little trouble with users closing the browser or moving to another page before the script has finished. In this case you will want to either continue to execute the script just shut it down depending on what the user has done.

PHP will not detect that the user has aborted the connection until an attempt is made to send information to the client. Simply using an echo statement does not guarantee that information is sent. Use the flush() function after the echo call to force PHP to sent output information to the browser.

To run the script to the end no matter what the user has done use the ignore_user_abort() function with the parameter of true.

JavaScript Working Text

18th January 2008 - 3 minutes read time

Letting the user now that something in the background is working is an essential part of website usability. If nothing at all happens then the user will more than likely either try again or go elsewhere. A good way of doing this is to have a little bit of text that says "Working" and animate dots behind it. Here is a function that will do this.

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How To Read A Remote IP Address In PHP

16th January 2008 - 2 minutes read time

PHP keeps certain variables to do with server and networking in an associative array called SERVER. To find out the remote address of a user you can use the array identifier REMOTE_ADDR. This is used in the following manner.

$ipaddress = $_SERVER['REMOTE_ADDR'];

This IP address can be passed into the gethostbyaddr() function to find out host name associated with the specified IP address.

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Setting php.ini Location In Apache

15th January 2008 - 2 minutes read time

After installing PHP on Apache you can use the php.ini file to set various different options to do with PHP. When Apache starts it uses what is contained in this file to set up and run PHP.

On both Windows, Unix and Linux systems Apache will look in a number of default locations for the php.ini file before giving up. You can explicitly tell Apache 2.x where to look for the file by using the PHPIniDir directive in the http.conf file.

  1. #
  2. # This is the directory containing php.ini
  3. #
  4. PHPIniDir "/usr/local/apache/conf"

For Apache 1.3.x this can be set using the SetEnv PHPRC directive.

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Some Useful Maths Functions In JavaScript

14th January 2008 - 4 minutes read time

All of the maths functions in JavaScript are kept in a handy object called Math, which contains a number of different functions.

To get the absolute value of a number use the abs() function.

Math.abs(3.14159265) // returns 3.14159265

Rounding a number is done by either the round() function to round to the nearest integer, the ceil() function to round up to the nearest integer and the floor() function to round down to the nearest integer.