Create Facebook App, App ID, and App Secret<\/a><\/li>\n<\/ul>\nNote that:<\/span> The App ID and App secret need to be specified in the script at the time of Facebook API call. Also, the Valid OAuth Redirect URIs<\/b> must be matched with the Redirect URL that specified in the script.<\/p>\nCreate Database Table<\/h2>\n
To store the user’s profile information from Facebook, a table needs to be created in the database. The following SQL creates a users<\/code> table with some basic fields in the MySQL database to hold the Facebook account information.<\/p>\nCREATE<\/span> TABLE<\/span> `users`<\/span> (\r\n `id`<\/span> int<\/span>(11<\/span>) NOT<\/span> NULL<\/span> AUTO_INCREMENT,\r\n `oauth_provider`<\/span> varchar<\/span>(50<\/span>) DEFAULT<\/span> NULL<\/span> COMMENT<\/span> 'FACEBOOK\/GOOGLE\/X\/LINKEDIN'<\/span>,\r\n `oauth_uid`<\/span> varchar<\/span>(100<\/span>) DEFAULT<\/span> NULL<\/span>,\r\n `first_name`<\/span> varchar<\/span>(25<\/span>) DEFAULT<\/span> NULL<\/span>,\r\n `last_name`<\/span> varchar<\/span>(25<\/span>) DEFAULT<\/span> NULL<\/span>,\r\n `email`<\/span> varchar<\/span>(50<\/span>) DEFAULT<\/span> NULL<\/span>,\r\n `picture`<\/span> varchar<\/span>(255<\/span>) DEFAULT<\/span> NULL<\/span>,\r\n `created`<\/span> datetime NOT<\/span> NULL<\/span> DEFAULT<\/span> current_timestamp<\/span>(),\r\n `modified`<\/span> datetime DEFAULT<\/span> NULL<\/span>,\r\n PRIMARY KEY<\/span> (`id`<\/span>)\r\n) ENGINE<\/span>=InnoDB<\/span> DEFAULT<\/span> CHARSET<\/span>=utf8 COLLATE<\/span>=utf8_unicode_ci;<\/pre>\nFacebook SDK for PHP<\/h2>\n
The PHP SDK library allows you to access the Facebook Platform service from a PHP web application. In this example script, the facebook-graph-sdk<\/b> directory contains the latest version (v5) of the Facebook SDK for PHP.
\nNote that:<\/span> You don’t need to download it separately, all the required files of Facebook PHP SDK v5 are included in our Facebook Login PHP source code.<\/p>\nFacebook API and Database Configuration (config.php)<\/h2>\n
In the config.php<\/code> file, constant variables of the Facebook API and database settings are defined.
\nFacebook API Constants:<\/b><\/p>\n\n- FB_APP_ID – Specify the Facebook App ID.<\/li>\n
- FB_APP_SECRET – Specify the Facebook App Secret.<\/li>\n
- FB_REDIRECT_URL – Specify the Callback URL.<\/li>\n<\/ul>\n
Database Constants:<\/b><\/p>\n\n- DB_HOST – Specify the database host.<\/li>\n
- DB_USERNAME – Specify the database username.<\/li>\n
- DB_PASSWORD – Specify the database password.<\/li>\n
- DB_NAME – Specify the database name.<\/li>\n<\/ul>\n
Call Facebook API:<\/b><\/p>\n\n- The PHP SDK library is used to connect with Facebook API and working with OAuth client.<\/li>\n<\/ul>\n
<?php
<\/span>\/\/ Facebook API configuration
<\/span>define<\/span>(<\/span>'FB_APP_ID'<\/span>, <\/span>'_Facebook_App_ID_HERE_'<\/span>);
<\/span>define<\/span>(<\/span>'FB_APP_SECRET'<\/span>, <\/span>'_Facebook_App_Secret_HERE_'<\/span>);
<\/span>define<\/span>(<\/span>'FB_REDIRECT_URL'<\/span>, <\/span>'_Callback_URL_HERE_'<\/span>);
<\/span>\/\/ Database configuration
<\/span>define<\/span>(<\/span>'DB_HOST'<\/span>, <\/span>'localhost'<\/span>);
<\/span>define<\/span>(<\/span>'DB_USERNAME'<\/span>, <\/span>'root'<\/span>);
<\/span>define<\/span>(<\/span>'DB_PASSWORD'<\/span>, <\/span>'root'<\/span>);
<\/span>define<\/span>(<\/span>'DB_NAME'<\/span>, <\/span>'codexworld_db'<\/span>);
<\/span>\/\/ Start session
<\/span>if(!<\/span>session_id<\/span>()){
<\/span>session_start<\/span>();
}
<\/span>\/\/ Include the autoloader provided in the SDK
<\/span>require_once <\/span>__DIR__ <\/span>. <\/span>'\/facebook-graph-sdk\/autoload.php'<\/span>;
<\/span>\/\/ Include required libraries
<\/span>use <\/span>Facebook\\Facebook<\/span>;
use <\/span>Facebook\\Exceptions\\FacebookResponseException<\/span>;
use <\/span>Facebook\\Exceptions\\FacebookSDKException<\/span>;
<\/span>\/\/ Call Facebook API
<\/span>$fb <\/span>= new <\/span>Facebook<\/span>(array(
<\/span>'app_id' <\/span>=> <\/span>FB_APP_ID<\/span>,
<\/span>'app_secret' <\/span>=> <\/span>FB_APP_SECRET<\/span>,
<\/span>'default_graph_version' <\/span>=> <\/span>'v3.2'<\/span>,
));
<\/span>\/\/ Get redirect login helper
<\/span>$helper <\/span>= <\/span>$fb<\/span>-><\/span>getRedirectLoginHelper<\/span>();
<\/span>\/\/ Try to get access token
<\/span>try {
if(isset(<\/span>$_SESSION<\/span>[<\/span>'facebook_access_token'<\/span>])){
<\/span>$accessToken <\/span>= <\/span>$_SESSION<\/span>[<\/span>'facebook_access_token'<\/span>];
}else{
<\/span>$accessToken <\/span>= <\/span>$helper<\/span>-><\/span>getAccessToken<\/span>();
}
} catch(<\/span>FacebookResponseException $e<\/span>) {
echo <\/span>'Graph returned an error: ' <\/span>. <\/span>$e<\/span>-><\/span>getMessage<\/span>();
exit;
} catch(<\/span>FacebookSDKException $e<\/span>) {
echo <\/span>'Facebook SDK returned an error: ' <\/span>. <\/span>$e<\/span>-><\/span>getMessage<\/span>();
exit;
}
<\/span>?><\/span><\/pre>\nNote that:<\/span> You’ll find the App ID and App Secret on your Facebook App settings page.<\/p>\nDatabase Connection (dbConnect.php)<\/h2>\n
The dbConnect.php<\/code> file is used to connect the database using PHP and MySQL.<\/p>\n<?php
<\/span>\/\/ Connect with the database
<\/span>$db <\/span>= new <\/span>mysqli<\/span>(<\/span>DB_HOST<\/span>, <\/span>DB_USERNAME<\/span>, <\/span>DB_PASSWORD<\/span>, <\/span>DB_NAME<\/span>);
<\/span>\/\/ Display error if failed to connect
<\/span>if (<\/span>$db<\/span>-><\/span>connect_errno<\/span>) {
<\/span>printf<\/span>(<\/span>\"Connect failed: %s\\n\"<\/span>, <\/span>$db<\/span>-><\/span>connect_error<\/span>);
exit();
}
<\/span>?><\/span><\/pre>\nFacebook Authentication and Process Account Data (index.php)<\/h2>\n
In the index.php<\/code> file, the Facebook API authentication process is handled using PHP.<\/p>\n