- Add new example

ext/spl/examples/xml_xpath_tree.php

@@ -0,0 +1,122 @@
+<?php
+
+/** @file   xml_xpath_tree.php
+ * @brief   XML XPath Tree example
+ * @ingroup Examples
+ * @author  Marcus Boerger
+ * @date    2003 - 2005
+ * @version 1.0
+ *
+ * Usage: php xml_tree.php \<file\> \<xpath\> [\<len\>]
+ *
+ * Simply specify the xml file to tree with parameter \<file\>.
+ *
+ * The second parameter is a xpath expression to be evaluated.
+ *
+ * The third parameter allows to output a maximum of \<len\> characters of
+ * the element or attribute value.
+ */
+
+if ($argc < 3) {
+	echo <<<EOF
+Usage: php ${_SERVER['PHP_SELF']} <file>
+
+Displays a graphical tree for the elements in <file> <xpath> [<len>].
+
+<file>  The file for which to generate the tree graph.
+<xpath> An XPath expression to evaluate.
+<len>   Max length to display for attribute and element content (default: 0).
+
+
+EOF;
+	exit(1);
+}
+
+if (!class_exists("RecursiveTreeIterator", false)) require_once("recursivetreeiterator.inc");
+
+class SimpleXmlStructure extends AppendIterator implements RecursiveIterator
+{
+	function __construct($xml)
+	{
+		parent::__construct();
+		if (!is_null($xml))
+		{
+			$xml = is_object($xml) ? $xml : $xml = simplexml_load_file($xml, 'SimpleXmlIterator');
+			$this->append($xml);
+			$attr = $xml->attributes();
+			if ($attr)
+			{
+				$this->append($attr);
+			}
+		}
+	}
+
+	function key()
+	{
+		return ($this->getIteratorIndex() ? '@' : '') . parent::key();
+	}
+
+	function hasChildren()
+	{
+		return $this->getInnerIterator()->hasChildren()
+			|| !$this->getIteratorIndex();
+	}
+
+	function getChildren()
+	{
+		$inner = $this->getInnerIterator();
+		return $this->getIteratorIndex()
+		     ? $inner->getChildren()
+		     : new SimpleXmlStructure($inner->getChildren());
+	}
+	
+	function current()
+	{
+		global $len;
+		
+		if ($len)
+		{
+			$val = substr(parent::current(), 0, $len);
+			$nws = preg_replace("/([\r\n]|\s\s+)/e", " ", $val);
+			return ($this->getIteratorIndex() ? '= ' : ': ') . $nws;
+		}
+		else
+		{
+			return '';
+		}
+	}
+}
+
+class SimpleXMLXPathResult extends RecursiveArrayIterator
+{
+	function __construct($file, $xpath)
+	{
+		$xml = @simplexml_load_file($file, 'SimpleXmlIterator');
+		parent::__construct($xml ? $xml->xpath($xpath) : NULL);
+	}
+
+	function current()
+	{
+		return '';
+	}
+
+	function hasChildren()
+	{
+		return true;
+	}
+
+	function getChildren()
+	{
+		return new SimpleXmlStructure(parent::current());
+	}
+}
+
+$len = isset($argv[3]) ? $argv[3] : 0;
+$xml = new SimpleXMLXPathResult($argv[1], $argv[2]);
+$it  = new RecursiveTreeIterator($xml, RecursiveTreeIterator::BYPASS_CURRENT);
+foreach($it as $c=>$v)
+{
+	echo "$c$v\n";
+}
+
+?>