Consuming & embedding external content

Akshay Raje

@akshayrajeprofiles.wordpress.org/akshay_raje

WordPressjQueryHuman Resources

Biking

PHPJavaScript

$topics = array( 'HTTP requests in PHP/WordPress', 'Helper functions: GET, POST, HEAD', 'Request arguments', 'Caching: Object Caching and Transients API', 'Parsing', 'How WP Web Scraper helps');

if( in_array( $question, $topics ) !== true ) var_dump( $question );

Next 25 minutes:

@akshayraje

0: HTTP Requests in PHP/WordPress

@akshayraje

Multiple Transports, Functions, Environments

cURL

file_get_contents

fsockopenShared

Dedicated

VPS

IaaS

PaaS

fopenhttp

streams

Before AfterWord2

Press7

• Design & support own implementation

• Branch code for multiple transport implementations

• Duplication of code across plugins

• Standard API for core and plugins

• Wider environment support with fallbacks

• OO and helper Functional

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1: Helper functions: GET, POST, HEAD

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wp_remote_get() Retrieves a URL using the GET HTTP method.

wp_remote_post() Retrieves a URL using the POST HTTP method.

wp_remote_head() Retrieves a URL using the HEAD HTTP method.

wp_remote_request() Retrieves a URL using either the default GET or a custom HTTP method that you specify.

WP_HTTP Helper functions

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$url (string) (required) Site URL to retrieve.Default: None

$args (array) (optional) Override the defaults.Default: array()

WP_HTTP Helper functions

Parameters

Return Values(WP_Error|array) The response or WP_Error on failure.

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$response = wp_remote_get( 'http://httpbin.org/html' );

if ( is_wp_error( $response ) ) {echo 'Something went wrong: ' . $response-

>get_error_message();} else {

print_r( $response );}

<?code

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<?output

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2: Request arguments

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Default $args

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$args = array('timeout' => 10,'user-agent' => 'My-Bot','body' => array( 'username' => 'bob', 'password' => '1234xyz' )

); $response = wp_remote_post( 'http://httpbin.org/post', $args );

if ( is_wp_error( $response ) ) {echo 'Something went wrong: ' . $response->get_error_message();

} else {print_r( $response );

}

<?code POST example

3: Caching: Object Cache and Transients API

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Why Cache?

API Rate Limits

Blocking requestsOutgoing bandwidth

Avoid abusing web service

Page Load

No change in contentPaaS Rate Limits

What Cache?

Object Cache

Page Cache

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What Cache?

Object CachePersistent

Page Cache

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Object CachePersistent

W3 Total CacheWP Super CacheQuick CacheHyper CacheWP Fastest Cache

DiskAPC

eAcceleratorXCache

WinCacheMemcached

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Object CachePersistent

Transients API ‘guarantees’

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Use the Transients API instead of wp_cache functions if you need to guarantee that your data will be cached. If persistent caching is configured, then the transients functions will use the wp_cache functions. However if persistent caching has not been enabled, then the data will instead be cached to the options table.

Source: http://codex.wordpress.org/Class_Reference/WP_Object_Cache

“

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$transient (string) (required) Unique transient name. 45 characters or less in length.Default: None

Transients functions

get_transient( $transient )

Pretty much like get_option( $option )

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Transients functions

set_transient($transient, $value, $expiration)

Pretty much like set_option( $option, $value )

$transient (string) (required) Unique transient name. 45 characters or less in length.Default: None

$value (mixed) (required) Transient value. Default: None

$expiration (int) (optional) Time until expiration in seconds from now, or 0 for never expires. Default: 0.

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// Get any existing copy of transient data if available

if ( false === ( $response = get_transient( 'special_wp_remote_get' ) ) ) {

$response = wp_remote_get( 'http://httpbin.org/html' );

if ( !is_wp_error( $response ) ) {set_transient( 'special_wp_remote_get', $response, 12 *

HOUR_IN_SECONDS );}

}

// Use $response like you would have normally...

<?code Cached wp_remote_get

4: Parsing

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<?output

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wp_remote_retrieve_body() Retrieves just the body from the response.

wp_remote_retrieve_header() Gives you a single HTTP header based on name from the response.

wp_remote_retrieve_headers() Returns all of the HTTP headers in an array for processing.

wp_remote_retrieve_response_code() Gives you the number for the HTTP response. This should be 200, but could be 4xx or even 3xx on failure.

wp_remote_retrieve_response_message() Returns the response message based on the response code.

WP_HTTP Helper functions

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JSON Native Objectjson_decode

XML XPath DOMDocument class

HTML XPathDOMDocument class

Parsing

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5: WP Web Scraper

wp-ws.networdpress.org/plugins/wp-web-scrapper

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