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Reads the entire contents of a file and returns it as a single string. Reads the entire contents of a file and returns it as an array of strings, one for each line. Reads the entire file and returns its contents as an array of bytes. Creates a file, writes a supplied string to the file, and closes it. If the file already exists, it is overwritten. Creates a file, writes a supplied array of strings to the file (separating each line with a hard return), and closes the file. If the file already exists, it is overwritten. Creates a file, writes a supplied byte array to the file, and closes it. If the file already exists, it is overwritten.

from SimpleXML to full-fledged Document Object Model (DOM) creation. However, these options have many limitations and, at times, frustrating and confusing APIs The XMLWriter class is being introduced in PHP 6 to provide a simple, straightforward, and easy-to-use method for XML document creation. The API for this component has not yet been fully developed, and it is likely to change. You can find the latest reference information at http://www.php.net/xmlwriter. Listing 5-15 is intended as a demonstration of how the API will eventually come together, but is not intended to be used as exact syntax. This listing builds a basic XHTML document for the output stream. Listing 5-15. A Sample XHTML Document < php //Instantiate and set indentation options $xml = new XMLWriter(); $xml->openURI('php://output'); $xml->setIndentString(' '); $xml->setIndent(true); //Start the document and set the DTD $xml->startDocument('1.0', 'UTF-8'); $xml->startDtd('html','-//W3C//DTD XHTML 1.0 Strict//EN', 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'); $xml->endDtd(); //Create the HTML document $xml->startElement('html'); $xml->writeAttribute('xmlns', 'http://www.w3.org/1999/xhtml'); $xml->writeAttribute('xml:lang', 'en'); $xml->writeAttribute('lang', 'en'); $xml->startElement('head'); $xml->writeElement('title', 'An example XHTML document.'); $xml->endElement(); $xml->startElement('body'); $xml->writeElement('p', 'Hello, World!'); $xml->startElement('p'); $xml->text('This paragraph contains an inline '); $xml->startElement('a'); $xml->writeAttribute('href','http://www.example.org'); $xml->text('link.'); $xml->endElement(); //a $xml->endElement(); //p

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The simplest level of file access just involves retrieving information about existing files and directories and performing typical file system operations such as copying files and creating directories. .NET provides five basic classes for retrieving this sort of information. They are all located in the System.IO namespace (and, incidentally, can be used in desktop applications in exactly the same way they are used in web applications). They include the following: The Directory and File classes, which provide shared methods that allow you to retrieve information about any files and directories visible from your server The DirectoryInfo and FileInfo classes, which use similar instance methods and properties to retrieve the same sort of information The DriveInfo class, which provides shared methods that allow you to retrieve information about a drive and the amount of free space it provides In 3, you saw how a class can provide two types of members. Shared members are always available you just use the name of the class. But instance members are only available if you have a live object. With the file access classes, shared methods are more convenient to use because they don t require you to create an instance of the class. That means you can use a quick one-line code statement to perform a simple task like checking whether a file exists. On the other hand, if you need to retrieve several pieces of information from the same file or directory, it s easier to use the instance members. That way, you don t need to keep specifying the name of the directory or file each time you call a method. The instance approach is also a bit faster in this situation. That s because the FileInfo and DirectoryInfo classes perform their security checks

ReadAllBytes() WriteAllText()

once when you create the object instance. The Directory and File classes perform a security check every time you invoke a method, which adds more overhead. You ll learn about all of these classes in this chapter. But first, it s worth taking a detour to look at another class that can simplify code that deals with the file system: the Path class.

WriteAllLines()

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