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To use the writer, you must first instantiate it and then set it up for the appropriate output. Its constructor does not take any arguments, and upon instantiation, it is pretty much just an empty shell until initialized writer new XMLWriter() writer- openURI('somefile.xml') If you want the data to remain in memory, thus making it available to be returned as a string, you use the openMemory() method, which takes no parameters, to initialize the writer writer- openMemory()
Our content-management system is going to need to do several things. Its most obvious purpose is to offer an environment where writers, editors, and administrators can create new stories. Additionally, it must offer a flexible series of stages through which a story moves. For example, if originally implemented with a single editorial stage, the application must be flexible enough to accommodate an additional editorial stage (or several of them) if needed. Additionally, this application must meet the various demands of a staff. There will be a series of writers, and some byline information will be presented with each story. Further, staff members will be assigned specific functions in the editorial process. Various levels of permission will ensure that not everyone will have the authority to edit or proofread a particular story, or to make that story available to the world at large.
When installing software packages that include a control panel or setup script, you should always either change the script's directory or, in the case of setup scripts, remove them after you're done installing. These scripts can provide a way for a random web surfer to mess up your configuration for the package you installed. While that isn't so bad, in a worst-case scenario, it could lead to hackers uploading PHP code of their choice and doing quite unpleasant things with your system. Most web-based packages recommend doing this in their installation instructions. Follow their advice they wrote the installation manual for a reason for you to read it As most technical writers say, Always published, never read. How many people do you personally know who actually read their alarm clock setup, DVD player setup, or manuals for any number of electronic devices
There are a number of issues involved in sending emails setting word-wrapping (and escaping it so long URLs don't get wrapped and broken up) for example, or sending attachments. The standard PHP functions can get quite complex here, and the result is that many code writers are tempted to avoid using these functions if they possibly can.
Not everyone is a fan of object-oriented programming. If you happen to be one of these people, then you are in luck with XMLWriter. It was originally developed to run under PHP 4.3 and was designed with a procedural-style interface. This interface is still available under PHP 5. Only two functions work a little differently than the corresponding methods, and these pertain to the initialization of the writer. Using procedural style, there is no such thing as the new keyword. The writer is created and initialized by a single function call, like so * Create procedural-style writer with memory buffer * writer xmlwriter_open_memory() * Create procedural-style writer with uri * writer xmlwriter_open_uri('somefile.xml') Looking at these function names should give you an idea of what the rest of them look like. Based on the object-oriented method name, simply append xmlwriter_ to the beginning of the method, add an underscore (_) between a lowercase character and an uppercase character, and...
Since this is the last chapter of the book, you should be comfortable with the different node types, such as element nodes, attribute nodes, comment nodes, and PI nodes. XMLWriter is an API that lets you create an XML document in almost the same manner that you would verbally describe the construction. Before I elaborate on this, just refer to a few of the writer methods in Table 21-1. You can find a complete list of XMLWriter methods, along with their prototypes, in Appendix B. determined by the method used to initialize the writer. writer new XMLWriter() writer- openMemory() writer- setIndent(TRUE) writer- setIndentString(' ') * Create the XML document * writer- startDocument() writer- startElement('root') writer- writeAttribute('att1', 'first') writer- writeElement('child1', 'some random content & text') writer- endElement() writer- endDocument() * Retrieve the current contents of the buffer * output writer- flush() Although not tested within the example, each of the methods...
Two methods used in Listing 21-1 that I have yet to explain are setIndent() and setIndentString(). Besides four other methods (two handle the writer initialization, which you have seen, and two manipulate the buffer, which is demonstrated in Listing 21-1 and covered in detail in the Handling the Buffer section), the indenting methods are the only other ones explicitly used to create the document. They are used for formatting. Like the DOM formatOutput property from Chapter 6, the setIndent() method instructs the writer to add line feeds and indentation at the appropriate places in the document. The default formatting used when the document is created is none. Unless manually added within the document, such as by calling writer- text( n ) , no line feeds or indentation is automatically added. You can toggle automatic formatting on and off by passing a Boolean to the setIndent() method * Turn on formatting * writer- setIndent(TRUE) * Turn off formatting * writer- setIndent(FALSE) What...
This example is nearly identical to the previous example, but the purpose is to demonstrate the difference made by just changing the archive writer to the File_Archive_Writer_Output object that's returned by the File_Archive toOutput() function. Instead of the archive file being persisted to the file system, the output is sent to STDOUT. If this file is called in a web browser, the archive is dynamically created and sent out to the browser. This is a wonderful capability if you're building a website where archive files might be dynamically built and downloaded by users.
Chapter 21, OtherXML Technologies and Extensions There are too many XML-based technologies to cover in a single book. In this chapter, I will introduce you to the XML-Writer and SDO XML Data Access Service extensions as well as show how to work with Ajax and Wireless Application Protocol (WAP) using PHI
Extracts files using the supplied reader into the supplied writer. The name of this be a little confusing, because you can use it to create an archive by extracting the file reader and writing them using an archive writer. The writer to use to create or append the archive. true if the writer should be closed when the call is complete.
You can send output from the writer to a URI or hold it in memory and retrieve it into strings. You set this up during the initialization phase of the writer, explained in the Initializing the Writer section. For example, Listing 21-1 is holding the output in memory. To retrieve the contents, you must call the method flush(). This method performs dual functionality. When working with memory, it returns a string containing the contents. When working with a URI, it flushes any data that may be sitting in the buffer to the output. When working with a buffer in memory, the flush() method is able to return a string in one of two ways. The first way, which is also the default behavior, simply returns the contents of the buffer to a string, clearing the content in the buffer. This is performed by the call writer- flush() . The next time flush() is called, only content added after the previous writer- flush() call is returned. One of the advantages of working with the writer is that you can...
This example demonstrates how to create a .tgz file using the File_Archive class. The extract() function is being used here to extract the files from the File_Archive_Reader, which is created with the File_Archive read() function using the file URL tmp sampledir. The archive is written using the File_Archive_Writer object that's returned by the File_Archive toArchive() function, using the extension of the filename as the archive type. The File_Archive toFiles() function specifies the type of writer that's used to write the archive. Notice Use of undefined constant filename - assumed 'filename' in on line 201. * into the archive writer. *
Initializes the writer and sets the URI to which the data will be written. Initializes the writer using memory to provide string output. Sends the writer buffer to the output. The return type depends upon the output method being used (memory or URI). The empty parameter, default FALSE, determines whether the writer buffer is cleared when data is sent to output.
This book wouldn't have been possible without help from many people. First, I need to thank Terri Varveris for her unending patience with a writer on his first book as well as Pat O'Brien. Everyone at Wiley has been a pleasure to work with. Adam Goodman and Jeremy Zawodny from Linux Magazine offered some great help to a fledgling writer.
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