Why am I getting the \'Cannot use object of type mysqli_result as array\' error in PHP?

Fatal Error: Convert MySQL Result Object to Array

In this scenario, the error "Cannot use object of type mysqli_result as array" occurs due to an attempt to treat a MySQL result object as an array. The problematic code is located on line 303, where the developer uses in_array() to check if a specific value is within an array. However, the $followingdata['usergroupid'] variable actually holds a MySQL result object instead of an array.

Solution:

To resolve this issue, the developer needs to convert the MySQL result object to an array before attempting to use it in an array-based operation like in_array(). Two common methods to achieve this conversion are:

• mysqli_fetch_assoc(): Retrieves the next row of the result as an associative array.
• mysqli_fetch_array(MYSQLI_ASSOC): Retrieves the next row of the result as an array with both numeric and associative indices.

By modifying the code to use one of these methods, the developer can successfully convert the MySQL result object into an array, allowing them to proceed with the intended operation in line 303. An example of how the updated code might look like:

<code class="php">//Check if requested username can be followed.
$followingdata = $result->fetch_assoc();
if (in_array($followingdata['usergroupid'], explode("|", $vbulletin->options['subscribetouser_usergroups_cannot']))) {
    exit;
}</code>

By implementing this fix, the error should be resolved, and the website can open as expected. It's important to note that handling MySQL result objects and arrays correctly is crucial in PHP programming to avoid potential errors and ensure stable application functionality.

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