PHP versions 4 and 5
HTTP_HEADER_STATUS_100 = '100 Continue'
HTTP_HEADER_STATUS_101 = '101 Switching Protocols'
HTTP_HEADER_STATUS_102 = '102 Processing'
HTTP_HEADER_STATUS_200 = '200 OK'
Success Codes
HTTP_HEADER_STATUS_201 = '201 Created'
HTTP_HEADER_STATUS_202 = '202 Accepted'
HTTP_HEADER_STATUS_203 = '203 Non-Authoritative Information'
HTTP_HEADER_STATUS_204 = '204 No Content'
HTTP_HEADER_STATUS_205 = '205 Reset Content'
HTTP_HEADER_STATUS_206 = '206 Partial Content'
HTTP_HEADER_STATUS_207 = '207 Multi-Status'
HTTP_HEADER_STATUS_300 = '300 Multiple Choices'
HTTP_HEADER_STATUS_301 = '301 Moved Permanently'
HTTP_HEADER_STATUS_302 = '302 Found'
HTTP_HEADER_STATUS_303 = '303 See Other'
HTTP_HEADER_STATUS_304 = '304 Not Modified'
HTTP_HEADER_STATUS_305 = '305 Use Proxy'
HTTP_HEADER_STATUS_306 = '306 (Unused)'
HTTP_HEADER_STATUS_307 = '307 Temporary Redirect'
HTTP_HEADER_STATUS_400 = '400 Bad Request'
HTTP_HEADER_STATUS_401 = '401 Unauthorized'
HTTP_HEADER_STATUS_402 = '402 Payment Granted'
HTTP_HEADER_STATUS_403 = '403 Forbidden'
HTTP_HEADER_STATUS_404 = '404 File Not Found'
HTTP_HEADER_STATUS_405 = '405 Method Not Allowed'
HTTP_HEADER_STATUS_406 = '406 Not Acceptable'
HTTP_HEADER_STATUS_407 = '407 Proxy Authentication Required'
HTTP_HEADER_STATUS_408 = '408 Request Time-out'
HTTP_HEADER_STATUS_409 = '409 Conflict'
HTTP_HEADER_STATUS_410 = '410 Gone'
HTTP_HEADER_STATUS_411 = '411 Length Required'
HTTP_HEADER_STATUS_412 = '412 Precondition Failed'
HTTP_HEADER_STATUS_413 = '413 Request Entity Too Large'
HTTP_HEADER_STATUS_414 = '414 Request-URI Too Large'
HTTP_HEADER_STATUS_415 = '415 Unsupported Media Type'
HTTP_HEADER_STATUS_416 = '416 Requested range not satisfiable'
HTTP_HEADER_STATUS_417 = '417 Expectation Failed'
HTTP_HEADER_STATUS_422 = '422 Unprocessable Entity'
HTTP_HEADER_STATUS_423 = '423 Locked'
HTTP_HEADER_STATUS_424 = '424 Failed Dependency'
HTTP_HEADER_STATUS_500 = '500 Internal Server Error'
HTTP_HEADER_STATUS_501 = '501 Not Implemented'
HTTP_HEADER_STATUS_502 = '502 Bad Gateway'
HTTP_HEADER_STATUS_503 = '503 Service Unavailable'
HTTP_HEADER_STATUS_504 = '504 Gateway Time-out'
HTTP_HEADER_STATUS_505 = '505 HTTP Version not supported'
HTTP_HEADER_STATUS_507 = '507 Insufficient Storage'
HTTP_HEADER_STATUS_CLIENT_ERROR = 4
HTTP_HEADER_STATUS_INFORMATIONAL = 1
HTTP_HEADER_STATUS_REDIRECT = 3
HTTP_HEADER_STATUS_SERVER_ERROR = 5
HTTP_HEADER_STATUS_SUCCESSFUL = 2