PHP
From OpenStreetMap Wiki
PHP is a web scripting language. For OpenStreetMap applications/scripts/examples written in PHP (mostly open source) see Category:PHP
PHP Class to communicate with the API0.6
Sourcecode available here:
http://git.openstreetmap.nl/index.cgi/phposm.git/
Services_Openstreetmap
API 0.6 compatible, allows access to user information. XAPI support is planned. Going through the PEAR PEPr process.