在短代码中有条件地加载Facebook PHP SDK

从3.3开始，我们可以在短代码函数中有条件地将脚本排队，但当我尝试使用一些PHP类（使用session_start() 在__construct() 函数）您可以猜到，它给了我headers already sent 错误

问题是（这是使用Facebook PHP SDK in conjunction with the JS SDK), 我只想在帖子上存在一个短代码，并且当前帖子已经填写了2个元字段（类需要这2个值[应用ID和应用机密]）的情况下实例化这个类。

有没有简单的解决方案？如果是这样，我可以在下面的代码中更改什么来允许这样做？

public function fb_connect_shortcode( $atts, $content = null ) {
    extract( shortcode_atts( array( ), $atts ) ); /**/ global $post;
    $app_id = get_post_meta( $post->ID, $this->meta_prefix . \'AppID\', true );
    $app_secret = get_post_meta( $post->ID, $this->meta_prefix . \'AppSecret\', true );

    if( $app_id !== \'\' && $app_secret !== \'\' ) {

        /**
         * This is the class I am trying to instantiate conditionally
         * but since it uses session_start(), it can\'t send out headers
         */
        $facebook = new Facebook( array(
          \'appId\'  => $app_id,
          \'secret\' => $app_secret,
        ) );

        // See if there is a user from a cookie
        $user = $facebook->getUser();

        if( $user ) {
            try {
                // Proceed knowing you have a logged in user who\'s authenticated.
                $user_profile = $facebook->api( \'/me\' );
                $app_id = $facebook->getAppId();
            } catch( FacebookApiException $e ) {
                echo \'<pre>\' . htmlspecialchars( print_r( $e, true ) ) . \'</pre>\';
                $user = null;
            }
        }

        wp_enqueue_script( \'jw-fbsdk\', plugins_url( \'jw-fbsdk.js\', __FILE__ ), array(), \'3.3.1\', true );
        wp_localize_script( \'jw-fbsdk\', \'jwuc\', array(
            \'appId\' => $app_id,
            \'channelUrl\' => plugins_url( \'channel.php\', __FILE__ )
        ) );

        if( is_null( $content ) )
            $content = \'Connect with Facebook\';

        if( isset( $user_profile ) && $user_profile ) {
            return $user_profile[\'name\'];
        } else {
            return \'<div class="fb-login-button" data-scope="email,publish_stream,read_stream,status_update">\' . $content . \'</div>\';
        }

    } else {

        return "You forgot to add your App ID and/or App Secret! Facebook needs these. :)";

    }

}

require \'facebook.php\'; $urgent = JW_Urgent::getInstance(); class JW_Urgent { private static $instance; public $facebook; // Construct the class\' data private function __construct() { $this->facebook = null; add_action( \'wp\', array( &$this, \'define_facebook\' ) ); add_shortcode( \'jw-connect\', array( &$this, \'fb_connect_shortcode\' ) ); } public static function getInstance() { if ( is_null( self::$instance ) ) self::$instance = new JW_Urgent(); return self::$instance; } public function define_facebook() { global $post; $app_id = get_post_meta( $post->ID, $this->meta_prefix . \'AppID\', true ); $app_secret = get_post_meta( $post->ID, $this->meta_prefix . \'AppSecret\', true ); if( !is_null( $post ) && ( $app_id !== \'\' && $app_secret !== \'\' ) && $post->post_type == $this->post_type ) { if( strpos( $post->post_content, \'[jw-connect\' ) !== false ) { $this->facebook = new Facebook( array( \'appId\' => $app_id, \'secret\' => $app_secret ) ); } } } public function fb_connect_shortcode( $atts, $content = null ) { extract( shortcode_atts( array( ), $atts ) ); /**/ global $post; $app_id = get_post_meta( $post->ID, $this->meta_prefix . \'AppID\', true ); $app_secret = get_post_meta( $post->ID, $this->meta_prefix . \'AppSecret\', true ); if( $app_id !== \'\' && $app_secret !== \'\' && !is_null( $this->facebook ) ) { // See if there is a user from a cookie $user = $this->facebook->getUser(); if( $user ) { try { // Proceed knowing you have a logged in user who\'s authenticated. $user_profile = $this->facebook->api( \'/me\' ); $app_id = $this->facebook->getAppId(); } catch( FacebookApiException $e ) { echo \'<pre>\' . htmlspecialchars( print_r( $e, true ) ) . \'</pre>\'; $user = null; } } wp_enqueue_script( \'jw-fbsdk\', plugins_url( \'jw-fbsdk.js\', __FILE__ ), array(), \'3.3.1\', true ); wp_localize_script( \'jw-fbsdk\', \'jwuc\', array( \'appId\' => $app_id, \'channelUrl\' => plugins_url( \'channel.php\', __FILE__ ) ) ); if( is_null( $content ) ) $content = \'Connect with Facebook\'; if( isset( $user_profile ) && $user_profile ) { return $user_profile[\'name\']; } else { return \'<div class="fb-login-button" data-scope="email,publish_stream,read_stream,status_update">\' . $content . \'</div>\'; } } else { return "You forgot to add your App ID and/or App Secret! Facebook needs these. :)"; } } }

function has_my_FB_shortcode($posts) { if ( empty($posts) ) return $posts; $found = false; foreach ($posts as $post) { if ( stripos($post->post_content, \'[my_shortcode\') ){ $found = true; break; } } if ($found) require(\'path/to/facebook_sdk.php\'); return $posts; } add_action(\'the_posts\', \'has_my_FB_shortcode\');

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