PHP中cURL错误号对照[转]

PHP cURL curl_errno

于php程序编制中,使用curl函数库底几引领或那个高的,如curl_init()、curl_setopt()、curl_exec()、curl_errno()等还是常用的函数,尤其是于得到网页相关消息的时刻。
以运这些函数的当儿,有时见面逢有的题目,如前碰到的IIS运行PHP出现Call
to undefined function
curl_init()的题目,这些题目一般都比较基础,遇到题目并解决问题,是一个程序员成长之进程,在化解问题的经过遭到能够学会更多问题之外的学识。
今天当行使curl_errno()时,新的题材同时冒出了。如下语句:
if(!curl_errno($url)){… …}
程序运行时,{…
…}没有执行,说明if(!curl_errno($url))条件不也确实。不过是只有理解了原则不为真这个结果,而未知晓为什么未也实在,哪里有的题材?所以,这个题材亟待更进一步诊断,那就算是从curl_errno($url)的归来值获得错误的音讯。
如何从curl_errno返回值获取错误信息
curl_errno($url)会回来一个数值,这个数值或是0,也可能是其它。当是数值为0时,则印证没有问题,相当给返回false,而用当尺度语句里if(!curl_errno($url)){…
…},加了!后就改成true。所以当回数值是0时虽行if后面的重头戏语句,返回外数值时,不实行if后面的中心语句。
用,我们得一个左号以及错误信息的对照表即可,根据错误号找有相应之错误信息。

下附上错误号及错误信息的自查自纠资料

CURLE_OK (0)
All fine. Proceed as usual.

CURLE_UNSUPPORTED_PROTOCOL (1)
The URL you passed to libcurl used a protocol that this libcurl does not
support. The support might be a compile-time option that you didn’t use,
it can be a misspelled protocol string or just a protocol libcurl has no
code for.

CURLE_FAILED_INIT (2)
Very early initialization code failed. This is likely to be an internal
error or problem, or a resource problem where something fundamental
couldn’t get done at init time.

CURLE_URL_MALFORMAT (3)
The URL was not properly formatted.

CURLE_NOT_BUILT_IN (4)
A requested feature, protocol or option was not found built-in in this
libcurl due to a build-time decision. This means that a feature or
option was not enabled or explicitly disabled when libcurl was built and
in order to get it to function you have to get a rebuilt libcurl.

CURLE_COULDNT_RESOLVE_PROXY (5)
Couldn’t resolve proxy. The given proxy host could not be resolved.

CURLE_COULDNT_RESOLVE_HOST (6)
Couldn’t resolve host. The given remote host was not resolved.

CURLE_COULDNT_CONNECT (7)
Failed to connect() to host or proxy.

CURLE_FTP_WEIRD_SERVER_REPLY (8)
After connecting to a FTP server, libcurl expects to get a certain reply
back. This error code implies that it got a strange or bad reply. The
given remote server is probably not an OK FTP server.

CURLE_REMOTE_ACCESS_DENIED (9)
We were denied access to the resource given in the URL. For FTP, this
occurs while trying to change to the remote directory.

CURLE_FTP_ACCEPT_FAILED (10)
While waiting for the server to connect back when an active FTP session
is used, an error code was sent over the control connection or similar.

CURLE_FTP_WEIRD_PASS_REPLY (11)
After having sent the FTP password to the server, libcurl expects a
proper reply. This error code indicates that an unexpected code was
returned.

CURLE_FTP_ACCEPT_TIMEOUT (12)
During an active FTP session while waiting for the server to connect,
the CURLOPT_ACCEPTTIMOUT_MS (or the internal default) timeout expired.

CURLE_FTP_WEIRD_PASV_REPLY (13)
libcurl failed to get a sensible result back from the server as a
response to either a PASV or a EPSV command. The server is flawed.

CURLE_FTP_WEIRD_227_FORMAT (14)
FTP servers return a 227-line as a response to a PASV command. If
libcurl fails to parse that line, this return code is passed back.

CURLE_FTP_CANT_GET_HOST (15)
An internal failure to lookup the host used for the new connection.

CURLE_FTP_COULDNT_SET_TYPE (17)
Received an error when trying to set the transfer mode to binary or
ASCII.

CURLE_PARTIAL_FILE (18)
A file transfer was shorter or larger than expected. This happens when
the server first reports an expected transfer size, and then delivers
data that doesn’t match the previously given size.

CURLE_FTP_COULDNT_RETR_FILE (19)
This was either a weird reply to a ‘RETR’ command or a zero byte
transfer complete.

CURLE_QUOTE_ERROR (21)
When sending custom “QUOTE” commands to the remote server, one of the
commands returned an error code that was 400 or higher (for FTP) or
otherwise indicated unsuccessful completion of the command.

CURLE_HTTP_RETURNED_ERROR (22)
This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server
returns an error code that is >= 400.

CURLE_WRITE_ERROR (23)
An error occurred when writing received data to a local file, or an
error was returned to libcurl from a write callback.

CURLE_UPLOAD_FAILED (25)
Failed starting the upload. For FTP, the server typically denied the
STOR command. The error buffer usually contains the server’s explanation
for this.

CURLE_READ_ERROR (26)
There was a problem reading a local file or an error returned by the
read callback.

CURLE_OUT_OF_MEMORY (27)
A memory allocation request failed. This is serious badness and things
are severely screwed up if this ever occurs.

CURLE_OPERATION_TIMEDOUT (28)
Operation timeout. The specified time-out period was reached according
to the conditions.

CURLE_FTP_PORT_FAILED (30)
The FTP PORT command returned error. This mostly happens when you
haven’t specified a good enough address for libcurl to use. See
CURLOPT_FTPPORT.

CURLE_FTP_COULDNT_USE_REST (31)
The FTP REST command returned error. This should never happen if the
server is sane.

CURLE_RANGE_ERROR (33)
The server does not support or accept range requests.

CURLE_HTTP_POST_ERROR (34)
This is an odd error that mainly occurs due to internal confusion.

CURLE_SSL_CONNECT_ERROR (35)
A problem occurred somewhere in the SSL/TLS handshake. You really want
the error buffer and read the message there as it pinpoints the problem
slightly more. Could be certificates (file formats, paths, permissions),
passwords, and others.

CURLE_BAD_DOWNLOAD_RESUME (36)
The download could not be resumed because the specified offset was out
of the file boundary.

CURLE_FILE_COULDNT_READ_FILE (37)
A file given with FILE:// couldn’t be opened. Most likely because the
file path doesn’t identify an existing file. Did you check file
permissions?

CURLE_LDAP_CANNOT_BIND (38)
LDAP cannot bind. LDAP bind operation failed.

CURLE_LDAP_SEARCH_FAILED (39)
LDAP search failed.

CURLE_FUNCTION_NOT_FOUND (41)
Function not found. A required zlib function was not found.

CURLE_ABORTED_BY_CALLBACK (42)
Aborted by callback. A callback returned “abort” to libcurl.

CURLE_BAD_FUNCTION_ARGUMENT (43)
Internal error. A function was called with a bad parameter.

CURLE_INTERFACE_FAILED (45)
Interface error. A specified outgoing interface could not be used. Set
which interface to use for outgoing connections’ source IP address with
CURLOPT_INTERFACE.

CURLE_TOO_MANY_REDIRECTS (47)
Too many redirects. When following redirects, libcurl hit the maximum
amount. Set your limit with CURLOPT_MAXREDIRS.

CURLE_UNKNOWN_OPTION (48)
An option passed to libcurl is not recognized/known. Refer to the
appropriate documentation. This is most likely a problem in the program
that uses libcurl. The error buffer might contain more specific
information about which exact option it concerns.

CURLE_TELNET_OPTION_SYNTAX (49)
A telnet option string was Illegally formatted.

CURLE_PEER_FAILED_VERIFICATION (51)
The remote server’s SSL certificate or SSH md5 fingerprint was deemed
not OK.

CURLE_GOT_NOTHING (52)
Nothing was returned from the server, and under the circumstances,
getting nothing is considered an error.

CURLE_SSL_ENGINE_NOTFOUND (53)
The specified crypto engine wasn’t found.

CURLE_SSL_ENGINE_SETFAILED (54)
Failed setting the selected SSL crypto engine as default!

CURLE_SEND_ERROR (55)
Failed sending network data.

CURLE_RECV_ERROR (56)
Failure with receiving network data.

CURLE_SSL_CERTPROBLEM (58)
problem with the local client certificate.

CURLE_SSL_CIPHER (59)
Couldn’t use specified cipher.

CURLE_SSL_CACERT (60)
Peer certificate cannot be authenticated with known CA certificates.

CURLE_BAD_CONTENT_ENCODING (61)
Unrecognized transfer encoding.

CURLE_LDAP_INVALID_URL (62)
Invalid LDAP URL.

CURLE_FILESIZE_EXCEEDED (63)
Maximum file size exceeded.

CURLE_USE_SSL_FAILED (64)
Requested FTP SSL level failed.

CURLE_SEND_FAIL_REWIND (65)
When doing a send operation curl had to rewind the data to retransmit,
but the rewinding operation failed.

CURLE_SSL_ENGINE_INITFAILED (66)
Initiating the SSL Engine failed.

CURLE_LOGIN_DENIED (67)
The remote server denied curl to login (Added in 7.13.1)
CURLE_TFTP_NOTFOUND (68)
File not found on TFTP server.

CURLE_TFTP_PERM (69)
Permission problem on TFTP server.

CURLE_REMOTE_DISK_FULL (70)
Out of disk space on the server.

CURLE_TFTP_ILLEGAL (71)
Illegal TFTP operation.

CURLE_TFTP_UNKNOWNID (72)
Unknown TFTP transfer ID.

CURLE_REMOTE_FILE_EXISTS (73)
File already exists and will not be overwritten.

CURLE_TFTP_NOSUCHUSER (74)
This error should never be returned by a properly functioning TFTP
server.

CURLE_CONV_FAILED (75)
Character conversion failed.

CURLE_CONV_REQD (76)
Caller must register conversion callbacks.

CURLE_SSL_CACERT_BADFILE (77)
Problem with reading the SSL CA cert (path? access rights?)
CURLE_REMOTE_FILE_NOT_FOUND (78)
The resource referenced in the URL does not exist.

CURLE_SSH (79)
An unspecified error occurred during the SSH session.

CURLE_SSL_SHUTDOWN_FAILED (80)
Failed to shut down the SSL connection.

CURLE_AGAIN (81)
Socket is not ready for send/recv wait till it’s ready and try again.
This return code is only returned from curl_easy_recv(3) and
curl_easy_send(3) (Added in 7.18.2)

CURLE_SSL_CRL_BADFILE (82)
Failed to load CRL file (Added in 7.19.0)

CURLE_SSL_ISSUER_ERROR (83)
Issuer check failed (Added in 7.19.0)

CURLE_FTP_PRET_FAILED (84)
The FTP server does not understand the PRET command at all or does not
support the given argument. Be careful when using
CURLOPT_CUSTOMREQUEST, a custom LIST command will be sent with PRET CMD
before PASV as well. (Added in 7.20.0)

CURLE_RTSP_CSEQ_ERROR (85)
Mismatch of RTSP CSeq numbers.

CURLE_RTSP_SESSION_ERROR (86)
Mismatch of RTSP Session Identifiers.

CURLE_FTP_BAD_FILE_LIST (87)
Unable to parse FTP file list (during FTP wildcard downloading).

CURLE_CHUNK_FAILED (88)
Chunk callback reported error.

即使自己遇到的问题,curl_errno()返回值是6,通过上述材料查询,得知原委是Couldn’t
resolve host. The given remote host was not
resolved.即是“解析主机失败”的原委,至此,我虽明白哪些去进一步缓解是题材了。

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