class Crawler extends SplObjectStorage

Crawler eases navigation of a list of \DOMNode objects.

Methods

__construct(mixed $node = null, string $uri = null)

Constructor.

clear()

Removes all the nodes.

add(DOMNodeList|DOMNode|array|string|null $node)

Adds a node to the current list of nodes.

addContent(string $content, null|string $type = null)

Adds HTML/XML content.

addHtmlContent(string $content, string $charset = 'UTF-8')

Adds an HTML content to the list of nodes.

addXmlContent(string $content, string $charset = 'UTF-8')

Adds an XML content to the list of nodes.

addDocument(DOMDocument $dom)

Adds a \DOMDocument to the list of nodes.

addNodeList(DOMNodeList $nodes)

Adds a \DOMNodeList to the list of nodes.

addNodes(array $nodes)

Adds an array of \DOMNode instances to the list of nodes.

addNode(DOMNode $node)

Adds a \DOMNode instance to the list of nodes.

eq(integer $position)

Returns a node given its position in the node list.

array
each(Closure $closure)

Calls an anonymous function on each node of the list.

reduce(Closure $closure)

Reduces the list of nodes by calling an anonymous function.

first()

Returns the first node of the current selection

last()

Returns the last node of the current selection

siblings()

Returns the siblings nodes of the current selection

nextAll()

Returns the next siblings nodes of the current selection

previousAll()

Returns the previous sibling nodes of the current selection

parents()

Returns the parents nodes of the current selection

children()

Returns the children nodes of the current selection

string
attr(string $attribute)

Returns the attribute value of the first node of the list.

string
text()

Returns the node value of the first node of the list.

string
html()

Returns the first node of the list as HTML.

array
extract(array $attributes)

Extracts information from the list of nodes.

filterXPath(string $xpath)

Filters the list of nodes with an XPath expression.

filter(string $selector)

Filters the list of nodes with a CSS selector.

selectLink(string $value)

Selects links by name or alt value for clickable images.

selectButton(string $value)

Selects a button by name or alt value for images.

link(string $method = 'get')

Returns a Link object for the first node in the list.

Link[]
links()

Returns an array of Link objects for the nodes in the list.

form(array $values = null, string $method = null)

Returns a Form object for the first node in the list.

static string
xpathLiteral(string $s)

Converts string for XPath expressions.

Details

at line line 38
__construct(mixed $node = null, string $uri = null)

Constructor.

Parameters

mixed $node A Node to use as the base for the crawling
string $uri The current URI or the base href value

at line line 50
clear()

Removes all the nodes.

at line line 67
add(DOMNodeList|DOMNode|array|string|null $node)

Adds a node to the current list of nodes.

This method uses the appropriate specialized add*() method based on the type of the argument.

Parameters

DOMNodeList|DOMNode|array|string|null $node A node

Exceptions

InvalidArgumentException When node is not the expected type.

at line line 92
addContent(string $content, null|string $type = null)

Adds HTML/XML content.

If the charset is not set via the content type, it is assumed to be ISO-8859-1, which is the default charset defined by the HTTP 1.1 specification.

Parameters

string $content A string to parse as HTML/XML
null|string $type The content type of the string

at line line 142
addHtmlContent(string $content, string $charset = 'UTF-8')

Adds an HTML content to the list of nodes.

The libxml errors are disabled when the content is parsed.

If you want to get parsing errors, be sure to enable internal errors via libxmluseinternalerrors(true) and then, get the errors via libxmlgeterrors(). Be sure to clear errors with libxmlclear_errors() afterward.

Parameters

string $content The HTML content
string $charset The charset

at line line 201
addXmlContent(string $content, string $charset = 'UTF-8')

Adds an XML content to the list of nodes.

The libxml errors are disabled when the content is parsed.

If you want to get parsing errors, be sure to enable internal errors via libxmluseinternalerrors(true) and then, get the errors via libxmlgeterrors(). Be sure to clear errors with libxmlclear_errors() afterward.

Parameters

string $content The XML content
string $charset The charset

at line line 225
addDocument(DOMDocument $dom)

Adds a \DOMDocument to the list of nodes.

Parameters

DOMDocument $dom A \DOMDocument instance

at line line 239
addNodeList(DOMNodeList $nodes)

Adds a \DOMNodeList to the list of nodes.

Parameters

DOMNodeList $nodes A \DOMNodeList instance

at line line 253
addNodes(array $nodes)

Adds an array of \DOMNode instances to the list of nodes.

Parameters

array $nodes An array of \DOMNode instances

at line line 267
addNode(DOMNode $node)

Adds a \DOMNode instance to the list of nodes.

Parameters

DOMNode $node A \DOMNode instance

at line line 285
Crawler eq(integer $position)

Returns a node given its position in the node list.

Parameters

integer $position The position

Return Value

Crawler A new instance of the Crawler with the selected node, or an empty Crawler if it does not exist.

at line line 314
array each(Closure $closure)

Calls an anonymous function on each node of the list.

The anonymous function receives the position and the node wrapped in a Crawler instance as arguments.

Example:

$crawler->filter('h1')->each(function ($node, $i) {
    return $node->text();
});

Parameters

Closure $closure An anonymous function

Return Value

array An array of values returned by the anonymous function

at line line 335
Crawler reduce(Closure $closure)

Reduces the list of nodes by calling an anonymous function.

To remove a node from the list, the anonymous function must return false.

Parameters

Closure $closure An anonymous function

Return Value

Crawler A Crawler instance with the selected nodes.

at line line 354
Crawler first()

Returns the first node of the current selection

Return Value

Crawler A Crawler instance with the first selected node

at line line 366
Crawler last()

Returns the last node of the current selection

Return Value

Crawler A Crawler instance with the last selected node

at line line 380
Crawler siblings()

Returns the siblings nodes of the current selection

Return Value

Crawler A Crawler instance with the sibling nodes

Exceptions

InvalidArgumentException When current node is empty

at line line 398
Crawler nextAll()

Returns the next siblings nodes of the current selection

Return Value

Crawler A Crawler instance with the next sibling nodes

Exceptions

InvalidArgumentException When current node is empty

at line line 416
Crawler previousAll()

Returns the previous sibling nodes of the current selection

Return Value

Crawler A Crawler instance with the previous sibling nodes

Exceptions

InvalidArgumentException

at line line 434
Crawler parents()

Returns the parents nodes of the current selection

Return Value

Crawler A Crawler instance with the parents nodes of the current selection

Exceptions

InvalidArgumentException When current node is empty

at line line 461
Crawler children()

Returns the children nodes of the current selection

Return Value

Crawler A Crawler instance with the children nodes

Exceptions

InvalidArgumentException When current node is empty

at line line 483
string attr(string $attribute)

Returns the attribute value of the first node of the list.

Parameters

string $attribute The attribute name

Return Value

string The attribute value

Exceptions

InvalidArgumentException When current node is empty

at line line 501
string text()

Returns the node value of the first node of the list.

Return Value

string The node value

Exceptions

InvalidArgumentException When current node is empty

at line line 517
string html()

Returns the first node of the list as HTML.

Return Value

string The node html

Exceptions

InvalidArgumentException When current node is empty

at line line 554
array extract(array $attributes)

Extracts information from the list of nodes.

You can extract attributes or/and the node value (_text).

Example:

$crawler->filter('h1 a')->extract(array('_text', 'href'));

Parameters

array $attributes An array of attributes

Return Value

array An array of extracted values

at line line 585
Crawler filterXPath(string $xpath)

Filters the list of nodes with an XPath expression.

Parameters

string $xpath An XPath expression

Return Value

Crawler A new instance of Crawler with the filtered list of nodes

at line line 611
Crawler filter(string $selector)

Filters the list of nodes with a CSS selector.

This method only works if you have installed the CssSelector Symfony Component.

Parameters

string $selector A CSS selector

Return Value

Crawler A new instance of Crawler with the filtered list of nodes

Exceptions

RuntimeException if the CssSelector Component is not available

Selects links by name or alt value for clickable images.

Parameters

string $value The link text

Return Value

Crawler A new instance of Crawler with the filtered list of nodes

at line line 648
Crawler selectButton(string $value)

Selects a button by name or alt value for images.

Parameters

string $value The button text

Return Value

Crawler A new instance of Crawler with the filtered list of nodes

Returns a Link object for the first node in the list.

Parameters

string $method The method for the link (get by default)

Return Value

Link A Link instance

Exceptions

InvalidArgumentException If the current node list is empty

Returns an array of Link objects for the nodes in the list.

Return Value

Link[] An array of Link instances

at line line 708
Form form(array $values = null, string $method = null)

Returns a Form object for the first node in the list.

Parameters

array $values An array of values for the form fields
string $method The method for the form

Return Value

Form A Form instance

Exceptions

InvalidArgumentException If the current node list is empty

at line line 744
static string xpathLiteral(string $s)

Converts string for XPath expressions.

Escaped characters are: quotes (") and apostrophe (').

Examples: echo Crawler::xpathLiteral('foo " bar'); //prints 'foo " bar'

echo Crawler::xpathLiteral("foo ' bar");
//prints "foo ' bar"

echo Crawler::xpathLiteral('a\'b"c');
//prints concat('a', "'", 'b"c')

Parameters

string $s String to be escaped

Return Value

string Converted string