PHP CSS Parser: Get HTML document nodes matching a CSS selector

# cssparser

Evaluates a CSS selector expression and filters nodes from a given DOMNode object. For example:

```php
// loads an xml document
$doc = new DOMDocument("1.0", "UTF-8");
$doc->load('test.xml');

// filters nodes
$p = new CSSParser($doc, 'books item.sci-fi.horror[author_id ^= theodore][author_id $= sturgeon]');
$nodes = $p->parse();

// prints nodes
foreach ($nodes as $node) {
    echo CSSHelper::dom2str($node) . "\n~~~\n";
}
```

### Supported features

#### Basic selectors:
1. [All Selector (“*”)](http://api.jquery.com/all-selector/)
2. [Class Selector (“.class”)](http://api.jquery.com/class-selector/)
3. [Element Selector (“element”)](http://api.jquery.com/element-selector/)
4. [ID Selector (“#id”)](http://api.jquery.com/id-selector/)
5. [Multiple Selector (“selector1, selector2, selectorN”)](http://api.jquery.com/multiple-selector/)

#### Child filters:
1. [:first-child Selector](http://api.jquery.com/first-child-selector/)
2. [:nth-child() Selector](http://api.jquery.com/nth-child-selector/)

#### Attribute filters:
1. [Attribute Contains Prefix Selector \[name|="value"\]](http://api.jquery.com/attribute-contains-prefix-selector/)
2. [Attribute Contains Selector \[name*="value"\]](http://api.jquery.com/attribute-contains-selector/)
3. [Attribute Contains Word Selector \[name~="value"\]](http://api.jquery.com/attribute-contains-word-selector/)
4. [Attribute Ends With Selector \[name$="value"\]](http://api.jquery.com/attribute-ends-with-selector/)
5. [Attribute Equals Selector \[name="value"\]](http://api.jquery.com/attribute-equals-selector/)
6. [Attribute Not Equal Selector \[name!="value"\]](http://api.jquery.com/attribute-not-equal-selector/)
7. [Attribute Starts With Selector \[name^="value"\]](http://api.jquery.com/attribute-starts-with-selector/)
8. [Has Attribute Selector \[name\]](http://api.jquery.com/has-attribute-selector/)
9. [Multiple Attribute Selector \[name="value"\]\[name2="value2"\]](http://api.jquery.com/multiple-attribute-selector/)