<?php
    $location = '';
    $username = '';
    $password = '';
    $database = '';

    $connection = mysql_connect($location, $username, $password);

    if(false === $connection)
    {
        die("MySQL connection is failed.");
    }

    if(!mysql_select_db($database, $connection))
    {
        die("Database selection is failed.");
    }

    $query = mysql_query
    ("
        SELECT *
        FROM `clients`
    ");

    if(false === $query)
    {
        die("SQL query is failed.");
    }

    while($data = mysql_fetch_assoc($query))
    {
        var_dump($data);
    }

    if(mysql_free_result($query))
    {
        die("Memory cleaning is failed.");
    }
}