What is the function of this code

<?php
$database = "starter_mag";
$password = "XXXXXXX";
$username = "XXXXXXX";
$hostname = "127.0.0.1";
$link = mysqli_connect($hostname, $username, $password, $database);
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
$sql = "SELECT distinct TABLE_NAME FROM Information_schema.columns where TABLE_SCHEMA = '$database' ORDER BY table_name  ASC";
$offset = 10000;
if($result = mysqli_query($link, $sql)){
    if(mysqli_num_rows($result) > 0){
        while($row = mysqli_fetch_array($result)){
            $tableName = $row['TABLE_NAME'];
            $count = 0;
            echo '------------------- INIT '.$tableName.' TABLE ---------------'.PHP_EOL;
            do{
                $tableQuery = "SELECT * FROM ".$tableName." limit ".$count*$offset.", $offset";
                if($resultTableQuery = mysqli_query($link, $tableQuery)) {
                    if (mysqli_num_rows($resultTableQuery) > 0) {
                        while ($tableRow = mysqli_fetch_array($resultTableQuery)) {
                            echo ('('.$count.') '.$tableName.': ');
                            echo implode(',',$tableRow);
                            echo PHP_EOL;
                        }
                    }
                }
                $count++;
            }while(mysqli_num_rows($resultTableQuery));
            echo '------------------- END  '.$tableName.'  TABLE ---------------'.PHP_EOL;
        }
        mysqli_free_result($result);
    }
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
mysqli_close($link);