错误：可恢复的致命错误：无法将类mysqli_result的对象转换为字符串

Question

我正在尝试从表中获取3个数据并出现此错误，第19行是$ ruang2

  

可恢复的致命错误：mysqli_result类的对象不能为   转换成字符串   第19行的C：\ xampp \ htdocs \ SIL \ HTML \ calender2 \ pinjamruang.php

$ruang=mysqli_query($con,"select * from t_peminjaman_ruang where id_ruang=$ruang and waktu_pinjam=$tanggal and id_sesi=$_POST[sesi1]");

$ruang2=mysqli_query($con,"select * from t_peminjaman_ruang where id_ruang=$ruang and waktu_pinjam=$tanggal and id_sesi=$_POST[sesi2]");

$ruang3=mysqli_query($con,"select * from t_peminjaman_ruang where id_ruang=$ruang and waktu_pinjam=$tanggal and id_sesi=$_POST[sesi3]");

Answer 1

尝试添加引号，如下所示

$ruang=mysqli_query($con,"select * from t_peminjaman_ruang where id_ruang='".$ruang."' and waktu_pinjam='".$tanggal."' and id_sesi='".$_POST[sesi1].'");