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Sqlite_create_function php

<?php    define("PPO",400);    function my($salary){       return $salary / PPO;    }    $sqldb = sqlite_open("mydatabase.db");    sqlite_create_function($sqldb,"myFunction", "my", 1);    $query = "select myFunction(salary) FROM employee WHERE empid=1";    $result = sqlite_query($sqldb, $query);    list($myFunction) = sqlite_fetch_array($result);    echo "The employee can purchase: ".$myFunction." ounces.";    sqlite_close($sqldb); ?>