Created April 2018 - version 0.1a
  chat.php   --- define("operational", true)  on
  chat.php   --- define("operational", false)  off

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CREATEchatlog.sql 
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CREATE TABLE chatlog {
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    message TEXT,
    sent_by VARCHAR(50),
    date_created INT(11)
};