Why is mysqli_query() Throwing an Error: \"mysqli_query() expects two parameters\"?

mysqli_query() Expects Two Parameters

The question pertains to errors encountered while executing a PHP script involving the use of mysqli_query(). The primary issue stems from the insufficient number of parameters provided to the mysqli_query() function.

Parameter Issue

As the error message indicates, mysqli_query() expects at least two parameters: a MySQLi link and the SQL query to be executed. However, the provided code only includes one parameter, the SQL query itself:

<code class="php">$search_query=mysqli_query($search_sql);</code>

To resolve this issue, the MySQLi link, which represents the connection to the database, must be specified as the first parameter. Here is the corrected code:

<code class="php">$search_query=mysqli_query($con, $search_sql);</code>

Additional Notes

The code also contains unnecessary lines that check for the availability of a "search" POST parameter before redirecting to home.php. These checks can be removed without affecting the core functionality of the script. Additionally, the use of short tags (?php) is discouraged as they can cause compatibility issues in different environments.

The above is the detailed content of Why is mysqli_query() Throwing an Error: \"mysqli_query() expects two parameters\"?. For more information, please follow other related articles on the PHP Chinese website!