Function to look up Object IDs

[StephenWall]

Add a function to lookup and return an OID, short name, and long name, given a string containing any one of those, for all OIDs known to OpenSSL.

Examples:

php > var_export(openssl_oid_lookup("CN"));
array (
  'oid' => '2.5.4.3',
  'lname' => 'commonName',
  'sname' => 'CN',
)
php > var_export(openssl_oid_lookup("unstructuredName"));
array (
  'oid' => '1.2.840.113549.1.9.2',
  'lname' => 'unstructuredName',
)
php > var_export(openssl_oid_lookup("1.2.3.4.5"));
array (
  'oid' => '1.2.3.4.5',
)
php > var_export(openssl_oid_lookup("junk"));
false