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The file_copy() function copies files into Drupal s file system path (typically sites/default/ files). The $source parameter is a file object, $destination is a string containing the destination of where the file should be copied to as a valid stream wrapper URI and $replace is the action that Drupal should take if the file already exists in the destination directory.

Figure 24-2. The namespaces of System.Xml.Linq.dll The core namespace, System.Xml.Linq, contains a very manageable set of classes that represent various aspects of an XML document (its elements and their attributes, XML namespaces, XML comments, and processing instructions, etc.). Table 24-1 documents the core members of System.Xml.Linq. Table 24-1. Select Members of the System.Xml.Linq Namespace

Represents an XML attribute on a given XML element. Represents a CDATA section in the XML document. Information in a CDATA section represents data in an XML document which must be included, but does not conform to the rules of XML grammars (for example, script code). Represents an XML comment. Represents the opening declaration of an XML document. Represents the entirety of an XML document.

file_move($source, $destination = NULL, $replace = FILE_EXISTS_RENAME)

Table 24-1. Select Members of the System.Xml.Linq Namespace (continued)

Represents a given element within an XML document, including the root element. Represents the name of an XML element or XML attribute. Represents an XML namespace. Represents the abstract concept of a node (element, comment, document type, processing instruction, or text node) in the XML tree. Represents an XML processing instruction. Represents elements in an XML tree that supports deferred streaming output.

In addition to the X* classes, System.Xml.Linq defines a class named Extensions, which (of course) defines a set of extension methods which typically extend IEnumerable<T>, where T is some descendent of XNode or XContainer. Table 24-2 documents some of the important extension methods to be aware of (as you will see, these are very useful when you wish to work with LINQ queries). Table 24-2. Select Members of the LINQ to XML Extensions Class

The file_move() function works just like the file_copy() function (in fact, it calls file_unmanaged_copy()), but also removes the original file by calling file_delete().

Ancestors<T>()

Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Returns a filtered collection of the attributes of every element in the source collection. Returns a collection of the descendant nodes of every document and element in the source collection. Returns a filtered collection of elements that contains the descendant elements of every element and document in the source collection. Returns a collection of the child elements of every element and document in the source collection. Returns a collection of the child nodes of every document and element in the source collection. Removes every attribute in the source collection from its parent element. Removes all occurrences of a given node from the source collection.

The file_prepare_directory(&$directory, $options=FILE_MODIFY_PERMISSIONS) function checks to see whether a directory exists and is writeable, which is a good thing to do before you attempt to write to that directory. The following example checks to see if the sites/default/files directory exists and is writeable. < php $directory = 'sites/default/files'; if (file_prepare_directory(&$directory, $options = FILE_MODIFY_PERMISSIONS)) { echo "The directory exists and is writeable"; } else { echo "The file does not exist or it is not writeable"; }

Attributes()

DescendantNodes<T>()

Although field API and its file field offer a full-fledged implementation of file uploading for nodes, sometimes you just want to be able to upload a file that is not associated with a node. The following functions can help in that situation.

Remove()

Remove<T>()

file_save_upload($source, $validators = array(), $destination = FALSE, $replace = FILE_EXISTS_RENAME)

As you can tell from their names, these methods allow query a loaded XML tree to find elements, attributes, and their values. Collectively, these methods are termed axis methods, or simply axes. You can apply these methods directly to parts of a tree of nodes, or use them to build more elaborate LINQ queries.