Php代码给出了关于mysqli_result的错误......？

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问题描述

<？php

//这里已经完成了与数据库的连接，但是已经把它遗漏了

//航班

$ sql =SELECT f.Flight_no，fi.DepartureDate ..（有太多的行要添加，所以在这里留下这个）

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

if（mysqli_num_rows（$ result）> 0）＃5

{

if（strcmp（$ _ GET ['optradio']，oneway）== 0）-----问题

{

echo（

航班

）;

}

我的尝试：

我已经在此代码之前完成了数据库连接，所有工作都在这里工作。问题出现在第5行。显示代码运行时出现的错误是警告：mysqli_num_rows（）期望参数1为mysqli_result，在家中给出布尔值/ .....

我看过网上并尝试了很多方法来修复它但没有任何工作。任何可能出错的解释？

<?php
//Have done the connections to the db here but have left it out
//flights
$sql = "SELECT f.Flight_no, fi.DepartureDate..(there are too many rows to add so left this out here)
$result = mysqli_query($link,$sql);

if (mysqli_num_rows($result)>0) #5

{
if(strcmp($_GET['optradio'],"oneway")==0) ----- problem
{
echo("

Flights

");
}

What I have tried:

I have already done the database connection before this code and everything up until here works. The problem occurs on line 5. The error that shows when the code has been run is Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in home/.....
I've looked online and attempted many ways of fixing it but nothing is working. Any explanation of what could be wrong?