Why Does My MySQLi `update` Statement Throw a 'Call to a Member Function bind_param()' Error?

Mysqli update Throws Call to a Member Function bind_param() Error: Troubleshooting

When attempting to update a row using mysqli and encountering the error "Call to a member function bind_param()", it typically indicates a deeper issue rather than a standalone error. Here are possible causes and solutions to resolve this issue:

Verifying Query Syntax

The root cause of the bind_param() error is often an invalid query statement. Ensure that the query being prepared in updateColumn() is syntactically correct. Check if there are any missing or incorrect characters, such as single or double quotes, or unclosed brackets.

Custom Error Handling

Procedural mysqli functions do not throw errors by default, rather they return FALSE upon failure. To identify the actual error, implement custom error handling by checking $stmt or $res (when using the procedural style) after calling prepare() or mysqli_query():

if (!$stmt = $memberMysqli->prepare($query)) {
    trigger_error($memberMysqli->error . "[$query]");
}

Trapping Exceptions

If you are encapsulating queries in a class, utilize exceptions to provide a stack trace and identify the source of the erroneous query:

try {
    $result = $memberMysqli->query($sql);
} catch (Exception $e) {
    throw new Exception($e->getMessage() . " [$query]");
}

Examining Error Logs

If you are running your script in a live environment, configure your server to log errors. This can be done by setting ini_set('log_errors', 1) in your php.ini file or .htaccess file.

Avoiding Error Suppression

Never suppress PHP errors using @ in front of statements. This practice conceals potential issues that may resurface later.

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