问题
Why am I getting this error message:
Warning: mysqli_free_result() expects parameter 1 to be mysqli_result, boolean given
My code is:
$statement = "INSERT INTO table1 (data1, data2) VALUES ('$variable1', '$variable2')";
if ($result = mysqli_query($conn,$statement)) {
echo "New record added successfully";
} else {
echo "Error adding records: " . $result . "<br>" . mysqli_error($conn);
}
echo "Adding records finished. ";
mysqli_free_result($result);
回答1:
As stated in the mysqli_query manual:
Returns FALSE on failure. For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. For other successful queries mysqli_query() will return TRUE.
Your insert query will return true or false, but not an object. So, calling mysqli_free_result will not work here.
来源：https://stackoverflow.com/questions/31557639/warning-mysqli-free-result-expects-parameter-1-to-be-mysqli-result-boolean-g