Why do I get this error?
Call to undefined function
mysql_real_escape_string()
Has it something to do with being old code?
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Yup, PHP7 removed `mysql_*` functions, thus you are getting such message. :) – Ikari Mar 25 '16 at 02:43
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What is the version of your PHP executable, you can find that using, running `php -v` in the CLI. – Ikari Mar 25 '16 at 02:44
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2Try to sign up for what? Is it your site? – Jon Mar 25 '16 at 02:46
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Seems like you are using PHP 7, in which many new features were added and the already deprecated item, mysql_* were removed, thus, it would generate an function alert just as you faced. So use either, mysqli_* or PDO. But don't mix DB apis!
Ikari
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