Warning:mysql_fetch_assoc()expectsparameter1toberesource?

$con = mysqli_connect(

 'localhost', /* The host to connect to 连接MySQL地址 */  

 'root',   /* The user to connect as 连接MySQL用户名 */  

 'root', /* The password to use 连接MySQL密码 */  

 'wechat');  /* The default database to query 连接数据库名称*/  

 

$sql = "SELECT * FROM abc";



$result = mysqli_query($con, $sql);



//将数据给弄出来

if (mysqli_num_rows($result) > 0){

   

$data = array();

while ($row = mysqli_fetch_assoc($result)) {

     $data[] = $row;

}



//随机个数，默认1

$rand_times = 1;

$rand_times = count($data)<$rand_times?count($data):$rand_times;

$ress = array();

for( $i=0;$i<$rand_times;$i++ ){

    $ress[] = $data[rand(0,count($data)-1)][0];

    echo $ress;

}

}

?>