Please don't pay someone to do this for you. I don't know your level of PHP, but coding a login is not that hard, and it's a great way to get started in learning or advancing your learning in PHP.
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If you do decide to try to code a login system by yourself, post here I'm sure you'll find some help. Its not too difficult, and the only way to know your login is secure is to understand how it works so it really is best to know how to code it yourself.