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universal excel parser
Re-arrange code for main logic to be include-able.
That way main logic can be reused (included) into other program e.g testing script, or other bigger program.
Now your code is prone to sql-injection attack.
Use
$stmt = mysqli_prepare($link, "INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
mysqli_stmt_bind_param($stmt, 'sssd', $code, $language, $official, $percent);
to bind query parameters.
Eliminate all "die" - because if included into bigger program, no need to kill whole program if something goes wrong during import. Rather return error to the calling parent function.
After portion of changes is completed, do release the code i.e. :
Eliminate db calls, but rather return import results as map[key=>value], key should be job line no (integer sequence 1,2,3...), value should be object (same as would be db record).
On success - return map, on error - boolean false.
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