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Turning ASCII Text Into HTML With PHP

25th April 2008 - 2 minutes read time

Providing a text box for users to type information in is very common, but usually people want to include line breaks and links with the text and they expect the site to lay it out just as they had intended it. The following function will turn any ASCII text string into the approximate HTML equivalent.

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Insert Random Data Into Rabid Ratings

24th April 2008 - 3 minutes read time

Rabid Ratings is a neat ratings script written with the Mootools JavaScript framework that makes adding a rating function to any site very easy. The only problem is that when you first install the script it looks like no-one has ever visited your site to leave a rating. To combat this you can create lots of phoney data that makes it look like your site is well visited and interesting. One way to do this is by getting lots of people to vote on every rating on the site. However, a much easier way is to do this with a few handy MySQL commands.

The following query will create a random vote of between 50 and 100 for each rateable value.

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Change MySQL Table Name

23rd April 2008 - 1 minute read time

To change a table name in MySQL you can use the ALTER TABLE command with the parameter RENAME TO. Here is an example of a query that will rename the table "atable" to "newtable".

ALTER TABLE atable RENAME TO newtable;

You could also use the RENAME TABLE command with the same effect.

RENAME TABLE atable TO newtable;

This is also useful for renaming all of the tables in the database, just separate each table rename command with a comma.

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Preventing Image Bandwidth Theft With .htaccess

21st April 2008 - 3 minutes read time

When people link to your images from their own site they are essentially using your bandwidth to show images on their site, this is also known as hotlinking.

The simplest way of preventing people from doing this is to add a .htaccess file to only allow locally linked images to be served. This checks the domain that is linking to your images by using the referrer and if the domain does not equal you own site then a different image is served, in this case blank.jpg.

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Debug Your PHP Applications With Krumo

20th April 2008 - 2 minutes read time

Krumo is an open source plugin for your programs that is designed as a replacement to print_r() and var_dump(). These functions are used by developers (myself included) to find out what the program is doing. The main problem is that if there is a lot of data to look at the page can get a bit busy.

Krumo

Krumo solves this by simplifying the output into a more readable format. It tells you the format of the array or object item and any other information that it can gain. It also puts the data into a set of clickable sections so that if you are interested in a particular section of output then you can click on it and see only that section.

This tool only has three files, the PHP code to integrate it into your projects, the JavaScript to create the clickable elements and the CSS to give the output some style. It is definitely worth a look.

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Cut A String To A Specified Length With PHP

17th April 2008 - 2 minutes read time

Cutting a string to a specified length is accomplished with the substr() function. For example, the following string variable, which we will cut to a maximum of 30 characters.

$string = 'This string is too long and will be cut short.';

The substr() function has three parameters. The first is the string, the second is where to start cutting from and the third is the amount of characters to cut to. So to cut to 30 characters we would use the following.

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Get Functions And Variables Of An Object With PHP

16th April 2008 - 2 minutes read time

It is possible to find out what functions and variables are available from an object at runtime using the PHP functions get_class_methods() and get_object_vars().

Take the following class called testClass.

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Getting The Current URI In PHP

15th April 2008 - 1 minute read time

The $_SERVER superglobal array contains lots of information about the current page location. You can print this off in full using the following line of code.

echo '<pre>'.print_r($_SERVER, true).'</pre>';

Although this array doesn't have the full URI we can piece together the current URI using bits of the $_SERVER array. The following function does this and returns a full URI.

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The Final Keyword In PHP5

14th April 2008 - 2 minutes read time

PHP5 allows you to stop classes being extended or to stop child classes overwriting functions.

The first way to use the final keyword is to stop child classes from overwriting functions when they are created. This can be used to stop an important function from being overwritten. To use the final keyword here just add it to the start of function name.