What does the error message "supplied argument is not a valid MySQL result resource" indicate in PHP?

The error message "supplied argument is not a valid MySQL result resource" indicates that the variable being passed as a parameter to a MySQL function is not a valid result resource. This typically occurs when there is an issue with the query execution or connection to the database. To solve this issue, you should check the query syntax, ensure that the database connection is established correctly, and verify that the query is returning a valid result resource. 

// Example fix for the "supplied argument is not a valid MySQL result resource" error
$conn = mysqli_connect("localhost", "username", "password", "database");

$query = "SELECT * FROM table";
$result = mysqli_query($conn, $query);

if($result) {
    // Process the query result
} else {
    echo "Error: " . mysqli_error($conn);
}

Keywords

PHP MySQL error message result resource validation

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