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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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DOMXPath->evaluate()

(no version information, might be only in CVS)

DOMXPath->evaluate() --  Evaluates the given XPath expression and returns a typed result if possible.

Description

class DOMXPath {

mixed evaluate ( string expression [, DOMNode contextnode] )

}

Executes the given XPath expression and returns a typed result if possible.

Parameters

expression

The XPath expression to execute.

contextnode

The optional contextnode can be specified for doing relative XPath queries. By default, the queries are relative to the root element.

Return Values

Returns a typed result if possible or a DOMNodeList containing all nodes matching the given XPath expression.

Examples

Example 1. Getting the count of all the english books

<?php

$doc = new DOMDocument;

$doc->load('book.xml');

$xpath = new DOMXPath($doc);

$tbody = $doc->getElementsByTagName('tbody')->item(0);

// our query is relative to the tbody node
$query = 'count(row/entry[. = "en"])';

$entries = $xpath->evaluate($query, $tbody);
echo "There are $entries english books\n";

?>

The above example will output:

There are 2 english books

See Also

DOMXPath->query()

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DOMXPath->__construct()UpDOMXPath->query()

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Another Useful functions:


function.dom-domxpath-registernamespace | function.dom-domxpath-query | function.dom-domxpath-evaluate | function.dom-domxpath-construct | function.dom-domtext-splittext | function.dom-domtext-iswhitespaceinelementcontent | function.dom-domtext-construct | function.dom-domprocessinginstruction-construct | function.dom-domnodelist-item | function.dom-domnode-replacechild | function.dom-domnode-removechild | function.dom-domnode-normalize | function.dom-domnode-lookupprefix | function.dom-domnode-lookupnamespaceuri | function.dom-domnode-issupported | function.dom-domnode-issamenode | function.dom-domnode-isdefaultnamespace | function.dom-domnode-insertbefore | function.dom-domnode-haschildnodes | function.dom-domnode-hasattributes | function.dom-domnode-clonenode | function.dom-domnode-appendchild | function.dom-domnamednodemap-item | function.dom-domnamednodemap-getnameditemns | function.dom-domnamednodemap-getnameditem | function.dom-domimplementation-hasfeature | function.dom-domimplementation-createdocumenttype | function.dom-domimplementation-createdocument | function.dom-domimplementation-construct | function.dom-domentityreference-construct | function.dom-domelement-setidattributens | function.dom-domelement-setidattributenode | function.dom-domelement-setidattribute | function.dom-domelement-setattributens | function.dom-domelement-setattributenodens | function.dom-domelement-setattributenode | function.dom-domelement-setattribute | function.dom-domelement-removeattributens | function.dom-domelement-removeattributenode | function.dom-domelement-removeattribute | function.dom-domelement-hasattributens | function.dom-domelement-hasattribute | function.dom-domelement-getelementsbytagnamens | function.dom-domelement-getelementsbytagname | function.dom-domelement-getattributens | function.dom-domelement-getattributenodens | function.dom-domelement-getattributenode | function.dom-domelement-getattribute | function.dom-domelement-construct | function.dom-domdocumentfragment-appendxml | function.dom-domdocument-xinclude | function.dom-domdocument-validate | function.dom-domdocument-schemavalidatesource | function.dom-domdocument-schemavalidate | function.dom-domdocument-savexml | function.dom-domdocument-savehtmlfile | function.dom-domdocument-savehtml | function.dom-domdocument-save | function.dom-domdocument-relaxngvalidatesource | function.dom-domdocument-relaxngvalidate | function.dom-domdocument-registernodeclass | function.dom-domdocument-normalizedocument | function.dom-domdocument-loadxml | function.dom-domdocument-loadhtmlfile | function.dom-domdocument-loadhtml | function.dom-domdocument-load | function.dom-domdocument-importnode | function.dom-domdocument-getelementsbytagnamens | function.dom-domdocument-getelementsbytagname | function.dom-domdocument-getelementbyid | function.dom-domdocument-createtextnode | function.dom-domdocument-createprocessinginstruction | function.dom-domdocument-createentityreference | function.dom-domdocument-createelementns | function.dom-domdocument-createelement | function.dom-domdocument-createdocumentfragment | function.dom-domdocument-createcomment | function.dom-domdocument-createcdatasection | function.dom-domdocument-createattributens | function.dom-domdocument-createattribute | function.dom-domdocument-construct | function.dom-domcomment-construct | function.dom-domcharacterdata-substringdata | function.dom-domcharacterdata-replacedata | function.dom-domcharacterdata-insertdata | function.dom-domcharacterdata-deletedata | function.dom-domcharacterdata-appenddata | function.dom-domattr-isid | function.dom-domattr-construct |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.