PHP, how to determine whether the MySQL statement has a return value, whether there is content

Found a lot on the internet, and did not find the right

Either there's a warning or it doesn't.

if (Is_resource ($result)), if (Mysql_result ($result)) is completely not.

if (Mysqli_fetch_row ($result)) is the best one to make, however, a warning appears when there is no content.

The correct method is if (Is_object ($result)) or if (!is_bool ($result)).

Event Description:

There are two types of SQL statements, one is show databases, select * from mysql.db so there are statements;

The other is, update run: Fundinfo Set fundname = ' propelled ' where spellid = ' YW ' So there are no returned statements.

Distinguishing between these two statements requires judgment.

How to resolve:

GetType () can determine the type.

$result is the type of object when it is displayed, or Boolean when no display.

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PHP, how to determine whether the MySQL statement has a return value, whether there is content