PHP mysqli_num_rows Tutorial

1 year ago
Liam
1 minute

The mysqli_num_rows function is used to retrieve the number of rows in a result set. The usage is as follows:

1. Establish a connection to the database:

$conn = mysqli_connect("localhost", "username", "password", "database_name");
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

2. Execute an SQL query and retrieve the result set.

$sql = "SELECT * FROM table_name";
$result = mysqli_query($conn, $sql);

3. Retrieve the number of rows in the result set using the mysqli_num_rows function.

$row_count = mysqli_num_rows($result);
echo "行数：" . $row_count;

The complete sample code is shown below:

$conn = mysqli_connect("localhost", "username", "password", "database_name");
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

$sql = "SELECT * FROM table_name";
$result = mysqli_query($conn, $sql);
$row_count = mysqli_num_rows($result);
echo "行数：" . $row_count;

mysqli_close($conn);

Note: Before using the mysqli_num_rows function, ensure that the SQL query has been executed and the result set has been obtained.

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