PHP Warning: mysql_query() expects parameter solution

If the following warning message appears when you use PHP: PHP Warning: mysql_query() expects parameter, it may be because the parameters provided when calling the mysql_query() function in your code are not enough or the parameter format is incorrect. caused.

The occurrence of this kind of error may affect the normal operation of your website. Fortunately, however, this problem is not difficult to solve. You can try the following methods to solve this problem:

1. Check whether the parameters in the statement are correct

When using the mysql_query() function, you need to provide two parameters , respectively, are SQL statements and connection objects. If you provide only one parameter when calling the mysql_query() function, or one of the two parameters provided is incorrect, the above warning message will appear.

Therefore, you need to check whether the SQL statement and connection object are correct and provide them to the mysql_query() function at the same time.

2. Check whether you are connected to the database

If you use the mysql_query() function in your code, then you need to ensure that you have successfully connected to the database before calling this function. Otherwise, the mysql_query() function will not execute.

You can check whether the connection object is correct, and also check whether the user name and password of the database are correct to ensure that you have successfully connected to the database.

3. Check whether the PHP version is too low

If your PHP version is too low, there may be problems related to the mysql_query() function. In PHP 5.5 and above, the mysql_query() function is deprecated and completely removed in PHP 7.0 and above.

Therefore, if your PHP version is too low, then you need to upgrade the PHP version, or use the mysqli_query() function instead of the mysql_query() function.

To sum up, if you encounter the problem PHP Warning: mysql_query() expects parameter when using the mysql_query() function, then you need to check whether the SQL statement and connection object are correct and ensure that you have connected to the database. , and consider upgrading the PHP version or using the mysqli_query() function instead of the mysql_query() function. As long as you follow the above methods, this problem can be solved quickly.

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