Note
In ISO 19111 terminology, what most people refer to as a Coordinate System is actually called a Coordinate Reference System (or CRS for short), with the term Coordinate System being used to refer to the axes used <builtincs>. PHPCoord's actual code uses the ISO naming system, although this documentation uses the more common version.
Tip
A constant has been defined for each and every built in CRS, with supporting docblocks that match the contents of the following pages. These should be searchable/available for autocomplete from inside your favourite IDE.
Tip
You can also access the list of supported CRSs at runtime using CoordinateReferenceSystem::getSupportedSRIDs() or CoordinateReferenceSystem::getSupportedSRIDsWithHelp()
builtin_crs_geocentric builtin_crs_geographic2d builtin_crs_geographic3d builtin_crs_projected builtin_crs_vertical builtin_crs_compound