What are common errors that may occur when using mysql_num_rows() in PHP?

Common errors that may occur when using mysql_num_rows() in PHP include not passing a valid result set as a parameter or not checking for errors before calling the function. To solve this issue, always ensure that you have successfully executed a query and obtained a valid result set before using mysql_num_rows(). Additionally, make sure to handle any potential errors that may occur during the query execution. 

// Check if the query was successful before using mysql_num_rows()
$result = mysqli_query($connection, "SELECT * FROM table");
if($result){
    $num_rows = mysqli_num_rows($result);
    echo "Number of rows: " . $num_rows;
} else {
    echo "Error executing query: " . mysqli_error($connection);
}

Keywords

mysql_num_rows PHP errors database query

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