Getting started with PHP Variables Arrays Functional Programming Types Autoloading Primer Exception Handling and Error Reporting Working with Dates and Time Sending Email Sessions Cookies Classes and Objects Password Hashing Functions Output Buffering JSON SOAP Client Reflection Using cURL in PHP Dependency Injection XML Regular Expressions (regexp/PCRE)Traits Namespaces Parsing HTML Composer Dependency Manager Magic Methods Alternative Syntax for Control Structures File handling Magic Constants Type hinting Multi Threading Extension Filters & Filter Functions Generators Operators Constants UTF-8 URLs Object Serialization PHPDoc Contributing to the PHP Manual String Parsing Loops Control Structures Serialization Closure Reading Request Data Type juggling and Non-Strict Comparison Issues Security PHP MySQLi Command Line Interface (CLI)Localization Debugging Superglobal Variables PHP Unit Testing Variable Scope References Compilation of Errors and Warnings Installing a PHP environment on Windows Datetime Class Headers Manipulation Performance Common Errors Installing on Linux/Unix Environments Contributing to the PHP Core Coding Conventions Using MongoDB Asynchronous programming Using SQLSRV Unicode Support in PHP Functions Create PDF files in PHP How to Detect Client IP Address YAML in PHP Image Processing with GD Multiprocessing SOAP Server Machine learning Cache Streams Array iteration Cryptography PDO SQLite3 Sockets Outputting the Value of a Variable String formatting Compile PHP Extensions mongo-php Manipulating an Array Executing Upon an Array Processing Multiple Arrays Together SPL data structures Comments IMAP Using Redis with PHP Imagick SimpleXML HTTP Authentication Recipes BC Math (Binary Calculator)Docker deployment WebSockets APCu Design Patterns Secure Remeber Me php mysqli affected rows returns 0 when it should return a positive integer PHP Built in server How to break down an URL PSR

Parsing HTML

Parsing HTML from a string

PHP implements a DOM Level 2 compliant parser, allowing you to work with HTML using familiar methods like getElementById() or appendChild().

$html = '<html><body><span id="text">Hello, World!</span></body></html>';

$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadHTML($html);

echo $doc->getElementById("text")->textContent;

Outputs:

Hello, World!

Note that PHP will emit warnings about any problems with the HTML, especially if you are importing a document fragment. To avoid these warnings, tell the DOM library (libxml) to handle its own errors by calling libxml_use_internal_errors() before importing your HTML. You can then use libxml_get_errors() to handle errors if needed.

Using XPath

$html = '<html><body><span class="text">Hello, World!</span></body></html>';

$doc = new DOMDocument();
$doc->loadHTML($html);

$xpath = new DOMXPath($doc);
$span = $xpath->query("//span[@class='text']")->item(0);

echo $span->textContent;

Outputs:

Hello, World!

SimpleXML

Presentation

SimpleXML is a PHP library which provides an easy way to work with XML documents (especially reading and iterating through XML data).
The only restraint is that the XML document must be well-formed.

Parsing XML using procedural approach

// Load an XML string
$xmlstr = file_get_contents('library.xml');
$library = simplexml_load_string($xmlstr);

// Load an XML file
$library = simplexml_load_file('library.xml');

// You can load a local file path or a valid URL (if allow_url_fopen is set to "On" in php.ini

Parsing XML using OOP approach

// $isPathToFile: it informs the constructor that the 1st argument represents the path to a file,
// rather than a string that contains 1the XML data itself.

// Load an XML string
$xmlstr = file_get_contents('library.xml');
$library = new SimpleXMLElement($xmlstr);

// Load an XML file
$library = new SimpleXMLElement('library.xml', NULL, true);

// $isPathToFile: it informs the constructor that the first argument represents the path to a file, rather than a string that contains 1the XML data itself.

Accessing Children and Attributes

When SimpleXML parses an XML document, it converts all its XML elements, or nodes, to properties of the resulting SimpleXMLElement object
In addition, it converts XML attributes to an associative array that may be accessed from the property to which they belong.

When you know their names:

$library = new SimpleXMLElement('library.xml', NULL, true);
foreach ($library->book as $book){
    echo $book['isbn'];
    echo $book->title;
    echo $book->author;
    echo $book->publisher;
}

The major drawback of this approach is that it is necessary to know the names of every element and attribute in the XML document.

When you don't know their names (or you don't want to know them):

foreach ($library->children() as $child){
    echo $child->getName();
    // Get attributes of this element
    foreach ($child->attributes() as $attr){
        echo ' ' . $attr->getName() . ': ' . $attr;
    }
    // Get children
    foreach ($child->children() as $subchild){
        echo ' ' . $subchild->getName() . ': ' . $subchild;
    }
}

Contributors

Topic Id: 1032

Example Ids: 3330,3331,27258

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