Fetch_field

In this article, we will focus on the mysqli_fetch_field() function in PHP, which is used to fetch meta-data for a single column from a result set. We will provide you with an overview of the function, how it works, and examples of its use.

Introduction to the mysqli_fetch_field() function

The mysqli_fetch_field() function is a built-in function in PHP that is used to fetch metadata for a single column from a MySQLi result set. This function is useful when you need to obtain information about a specific column in a MySQLi query result set.

How to use the mysqli_fetch_field() function

Using the mysqli_fetch_field() function is very simple. You just need to call the function on a valid MySQLi result set. Here is an example:

<?php
$mysqli = mysqli_connect("localhost", "username", "password", "database");

$query = "SELECT * FROM my_table";
$result = mysqli_query($mysqli, $query);

if ($result) {
    while ($field = mysqli_fetch_field($result)) {
        printf("Name: %s\n", $field->name);
        printf("Type: %s\n", $field->type);
        printf("Length: %d\n", $field->length);
    }
}

mysqli_close($mysqli);
?>

In this example, we call the mysqli_connect() function to connect to a MySQL database with a username and password. We then execute a query using the mysqli_query() function to select all columns from a table. We store the result in a variable and check if there was a result using the $result variable. If there was a result, we use a while loop to iterate over each column in the result set. For each column, we call the mysqli_fetch_field() function to fetch the metadata as an object. We then output the name, type, and length of the column.

Conclusion

In conclusion, the mysqli_fetch_field() function is a useful tool for obtaining metadata about a specific column in a MySQLi query result set. By understanding how to use the function, you can take advantage of this feature to create powerful and flexible MySQLi queries.