php - What is wrong with this MySQL insert statement? -

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i beginning php/mysql developer, , have written statement insert username , password database make account. reason getting error though; what's wrong?

mysql_query("insert signup (username, password, email) values ($username, $password, $email)") or die ("cnnot run query");

put quotes around $username, $password , $email.

you should use prepared statements. such usage prone sql injections


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