user13349: How can I convert a bitcoin public key to a bitcoin address?
Note: I am using PHP.
Is there an existing bitcoin API or PHP-API to do that converting ?

user17113: There is a step-by-step tutorial on the Bitcoin Wiki for converting Keys. 
For testing there is a very good website, where you can put in a private or public key and its show you the result of any step: http://gobittest.appspot.com/Address
If you dont want to do those things on your own you could use Bitcore, a JavaScript API for Bitcoin. For a pure PHP Libary there are some custom user projects on github, but I didn't tested any of them.

13349: <p>How can I convert a bitcoin public key to a bitcoin address?</p>

<p>Note: I am using PHP.</p>

<p>Is there an existing bitcoin API or PHP-API to do that converting ?</p>
 17113: <p>There is a <a href="https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses#How_to_create_Bitcoin_Address" rel="noreferrer">step-by-step tutorial</a> on the Bitcoin Wiki for converting Keys. </p>

<p>For testing there is a very good website, where you can put in a private or public key and its show you the result of any step: <a href="http://gobittest.appspot.com/Address" rel="noreferrer">http://gobittest.appspot.com/Address</a></p>

<p>If you dont want to do those things on your own you could use <a href="http://bitcore.io/" rel="noreferrer">Bitcore</a>, a JavaScript API for Bitcoin. For a pure PHP Libary there are some custom user projects on github, but I didn't tested any of them.</p>
