HomePHP Page 4 - Parsing Web Document Nodes with the Tidy Library in PHP 5
Using the tidy_get_body() and tidy_get_ouput() functions - PHP
Writing well-formatted (X)HTML code to include in the presentation layers of certain PHP applications can be an annoying and time-consuming process for many web developers. However, the Tidy extension that comes integrated with PHP 5 can turn this ugly task into a pleasant experience. Keep reading to learn how.
In consonance with the concepts expressed in the section that you just read, the last two functions included with the Tidy library that I plan to teach you in this tutorial will be the ones called "tidy_get_body()" and "tidy_get_output()." As you may guess, the first function comes in handy for extracting the <body> section of a concrete (X)HTML string, while the second one simply retrieves the whole string as a unique node.
Now that I have explained how these brand new Tidy functions work, please take a look at the following code samples, which demonstrate their rather limited functionality:
// example on using the 'tidy_get_body()' function
$html='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>Testing Tidy</title></head><body><p>Testing Tidy</p></body></html>'; $tidy=tidy_parse_string($html); $bodyNode=tidy_get_body($tidy); echo $bodyNode->value;
/* displays the following: <body> <p>Testing Tidy</p> </body> */
// example on using the 'tidy_get_output()' function
$html='<html><head><title>This file will be parsed by Tidy</title></head><body><p>This is an erroneous line</i>This is another erroneous line</i></body></html>'; $tidy=tidy_parse_string($html); $tidy->cleanRepair(); echo tidy_get_output($tidy);
/* displays the following: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title> This file will be parsed by Tidy </title> </head> <body> <p>This is an erroneous line</p> <p>This is another erroneous line</p> </body> </html> */
As you can see, the source code corresponding to the above examples is very easy to follow. In the first case, the "tidy_get_body()" function is used obviously to retrieve the <body> part of a sample (X)HTML string, certainly a procedure that doesn't bear too much discussion.
With reference to the second code listing, it simply demonstrates how to correct the format of the sample string via the already familiar "cleanRepair()" Tidy method, and then display the respective contents on the browser, in this case using the "tidy_get_output()" function. Quite simple, right?
Finally, as usual with many of my articles on PHP-based web development, feel free to modify the source code of all the examples shown here, if you want to continue exploring how to handle these useful Tidy functions.
This second article of the series was entirely aimed at demonstrating how to use some simple functions bundled with the Tidy library to extract the different parts of a specified (X)HTML string.
Nevertheless, this story is not yet finished, since in the last tutorial of the series I'm going to show you how to utilize Tidy's remarkable capabilities to keep track of the eventual errors that occur when parsing a web document. You won't want to miss it!