public static $httpStatuses = [
100 => 'Continue',
101 => 'Switching Protocols',
102 => 'Processing',
118 => 'Connection timed out',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
207 => 'Multi-Status',
208 => 'Already Reported',
210 => 'Content Different',
226 => 'IM Used',
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
306 => 'Reserved',
307 => 'Temporary Redirect',
308 => 'Permanent Redirect',
310 => 'Too many Redirect',
400 => 'Bad Request',
401 => 'Unauthorized',
402 => 'Payment Required',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Time-out',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Request Entity Too Large',
414 => 'Request-URI Too Long',
415 => 'Unsupported Media Type',
416 => 'Requested range unsatisfiable',
417 => 'Expectation failed',
418 => 'I\'m a teapot',
421 => 'Misdirected Request',
422 => 'Unprocessable entity',
423 => 'Locked',
424 => 'Method failure',
425 => 'Unordered Collection',
426 => 'Upgrade Required',
428 => 'Precondition Required',
429 => 'Too Many Requests',
431 => 'Request Header Fields Too Large',
449 => 'Retry With',
450 => 'Blocked by Windows Parental Controls',
451 => 'Unavailable For Legal Reasons',
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway or Proxy Error',
503 => 'Service Unavailable',
504 => 'Gateway Time-out',
505 => 'HTTP Version not supported',
507 => 'Insufficient storage',
508 => 'Loop Detected',
509 => 'Bandwidth Limit Exceeded',
510 => 'Not Extended',
511 => 'Network Authentication Required',
];
来源：oschina
链接：https://my.oschina.net/sallency/blog/3192534