Use Facebook's SDK to determine whether the visitor has clicked and become a member of this site's fan group_PHP Tutorial

<?<span PHP
</span><span //</span><span 調用函數把結果賦值給變數</span>
<span $a</span>=is_Like('213202422194942'<span );
</span><span if</span>(<span $a</span>[0]===<span TRUE</span><span ) {
    </span><span echo</span> '已經按讃'<span ;
}</span><span else</span><span {
    </span><span echo</span> <span $a</span>[1<span ];
}
</span><span unset</span>(<span $a</span>);    <span //</span><span 釋放變數</span>
<span die</span><span ();

</span><span /*</span><span *
    判斷用戶是否已經按讃(粉絲團)
    參數:
        $pid:int型,粉絲團的id,這個值可以用firebug抓得到,如果不會可以進我的QQ群223494678討論
    返回:
        array(
            0=>bool型,[已經按讃則TRUE;反之FALSE]
            1=>str型,當[0]=FALSE時的提示內容
        )
    用法:
        $a=is_Like('213202422194942');
        if($a[0]===TRUE) {
            echo '已經按讃';
        }else{
            echo $a[1];
        }
/*</span><span */</span>
<span function</span> is_Like(<span $pid</span><span ){
    </span><span if</span>(<span trim</span>(<span $pid</span>)=='') {<span return</span> <span array</span>(<span FALSE</span>,'粉絲團的ID不可為空!'<span );}

    </span><span //</span><span 調用SDK</span>
    <span require</span>('src/facebook.php'<span );

    </span><span //</span><span 實例化對象</span>
    <span $FB</span>=<span new</span> Facebook(<span array</span><span (
        </span>'appId' => '填寫你申請到的內容',
        'secret' => '填寫你申請到的內容',
        'cookie' => <span true</span>,<span 
    ));

    </span><span //</span><span 如果對象建立失敗</span>
    <span if</span>(!<span is_object</span>(<span $FB</span><span )) {
        </span><span unset</span>(<span $FB</span><span );
        </span><span return</span> <span array</span>(<span FALSE</span>,'加載Facebook的API失敗!'<span );
    }

    </span><span //</span><span 提取當前來訪者id</span>
    <span $uid</span> = <span $FB</span>-><span getUser();
    </span><span if</span>(!<span $uid</span>) {    <span //</span><span 如果id提取失敗,則要求用戶登錄</span>
        <span $r</span>=<span array</span>(<span FALSE</span>,'<a href="'.<span $FB</span>->getLoginUrl(<span array</span>('scope'=>'publish_stream')).'">點擊登入</a>'<span );
    }</span><span else</span>{        <span //</span><span 如果id提取成功
        //用FQL查詢該用戶在page_fan表內是否有關注id=213202422194942的粉絲頁</span>
        <span $fql</span>=<span $FB</span>->api(<span array</span>('method' => 'fql.query','query' => 'SELECT page_id from page_fan where page_id="'.<span $pid</span>.'" and uid='.<span $uid</span>.''<span ));
        </span><span if</span>(<span is_array</span>(<span $fql</span>) and <span isset</span>(<span $fql</span>[0]['page_id']) and <span trim</span>(<span $fql</span>[0]['page_id'])!=''<span ) {
            </span><span $r</span>=<span array</span>(<span TRUE</span>,''<span );
        }</span><span else</span><span {
            </span><span $r</span>=<span array</span>(<span FALSE</span>,'尚未按讃!'<span );
        }
    }

    </span><span //</span><span 釋放變數</span>
    <span unset</span>(<span $pid</span>,<span $fql</span>,<span $uid</span>,<span $FB</span><span );
    </span><span return</span> <span $r</span><span ;
}</span>