$sql = "SELECT COUNT(*) as total FROM man_hours WHERE uid = {$uid}";
$rs = $conn->query($sql);
然后我写的是
$rows = mysqli_fetch_array($rs);
他这里就报错了
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, bool given in C:\website\Apache24\htdocs\readexcel\public\tamplate\gongshi_total.php on line 69
我在phpmyadmin里面执行了一下
SELECT COUNT(*) AS total FROM man_hours WHERE uid = 'S5955'
获得的结果是
total
2
php版本是7.3.2
mysql版本是8.