How to make an API on php secure

Hi,

I'm creating an API from php which is called from some apps (Android and iPhone). This API has some calls for getting values on a database on the central server, so that data can be cached on the app. Also, this API has some calls for adding records on this database.

I am worried about security. I would like to avoid someone to add some gargabe records, and also avoiding someone to use the API to get a copy of our full database.

How can this be accomplished?
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gplanaAsked:
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aboo_sCommented:
You can add a user password to your api.
each function that the API runs will check if logged in  then executes.
and you can encrypt user and password.
You can also get https domain to maximize security.
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gplanaAuthor Commented:
https is a good idea. Thank you.
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Ray PaseurCommented:
Agree about HTTPS.  

This article has some more background information on APIs as well as a simple example of one that uses an API key.
http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/A_12239-Introduction-to-Application-Programming-Interfaces.html
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