mysql> LOAD DATA LOCAL INFILE '/path/pet.txt' INTO TABLE pet
-> LINES TERMINATED BY 'rn';

INSERT INTO yourtable VALUES (1,2), (5,5), ...

$file = file("content.txt"); //read file line by line
    foreach ($file as $val) {
        if (trim($val) != '') { //ignore empty lines
            mysql_query("INSERT INTO xxx SET club='" . $val . "'");
        }
    }

<?php
$conn = new PDO($dsn, $username, $password);
$stmt = $conn->prepare('INSERT INTO table VALUES (NULL, ?)');
foreach(file('list.txt') as $club) {
    $stmt->execute(array($club));
}

<?php
$servername = "localhost";
$username = "user";
$password = "pass";
$dbname = "db";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$file = file("list.txt"); //read file line by line
    foreach ($file as $val) {
        if (trim($val) != '') { //ignore empty lines
            $sql = "INSERT INTO `db`.`table` (`column`) VALUES ('$val');";
            if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
        }
    }
    ?>