What are some common reasons for the error "supplied argument is not a valid MySQL result resource" when using mysql_fetch_assoc() in PHP?

The error "supplied argument is not a valid MySQL result resource" typically occurs when the query executed with mysql_query() fails to return a valid result set. This can happen due to various reasons such as syntax errors in the SQL query, connection issues, or database errors. To solve this issue, you should check the query for errors, ensure the database connection is established correctly, and handle any potential errors that may occur during the query execution. 

// Example code snippet to handle the error "supplied argument is not a valid MySQL result resource"
$query = "SELECT * FROM table_name";
$result = mysql_query($query);

if (!$result) {
    die('Invalid query: ' . mysql_error());
}

while ($row = mysql_fetch_assoc($result)) {
    // Process the data here
}

mysql_free_result($result);

Keywords

PHP mysql_fetch_assoc() MySQL result resource error

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