Here's an array of cURL error codes and their respective constant names as strings. If you're looking for an array of descriptions of cURL error codes then look here: http://drewsbox.com/php-snippets/php-array-of-curl-errors

PHP array of cURL error codes and strings

<?php
$curl_error_codes = array (
  0 => 'CURLE_OK',
  1 => 'CURLE_UNSUPPORTED_PROTOCOL',
  2 => 'CURLE_FAILED_INIT',
  3 => 'CURLE_URL_MALFORMAT',
  4 => 'CURLE_NOT_BUILT_IN',
  5 => 'CURLE_COULDNT_RESOLVE_PROXY',
  6 => 'CURLE_COULDNT_RESOLVE_HOST',
  7 => 'CURLE_COULDNT_CONNECT',
  8 => 'CURLE_FTP_WEIRD_SERVER_REPLY',
  9 => 'CURLE_REMOTE_ACCESS_DENIED',
  10 => 'CURLE_FTP_ACCEPT_FAILED',
  11 => 'CURLE_FTP_WEIRD_PASS_REPLY',
  12 => 'CURLE_FTP_ACCEPT_TIMEOUT',
  13 => 'CURLE_FTP_WEIRD_PASV_REPLY',
  14 => 'CURLE_FTP_WEIRD_227_FORMAT',
  15 => 'CURLE_FTP_CANT_GET_HOST',
  17 => 'CURLE_FTP_COULDNT_SET_TYPE',
  18 => 'CURLE_PARTIAL_FILE',
  19 => 'CURLE_FTP_COULDNT_RETR_FILE',
  21 => 'CURLE_QUOTE_ERROR',
  22 => 'CURLE_HTTP_RETURNED_ERROR',
  23 => 'CURLE_WRITE_ERROR',
  25 => 'CURLE_UPLOAD_FAILED',
  26 => 'CURLE_READ_ERROR',
  27 => 'CURLE_OUT_OF_MEMORY',
  28 => 'CURLE_OPERATION_TIMEDOUT',
  30 => 'CURLE_FTP_PORT_FAILED',
  31 => 'CURLE_FTP_COULDNT_USE_REST',
  33 => 'CURLE_RANGE_ERROR',
  34 => 'CURLE_HTTP_POST_ERROR',
  35 => 'CURLE_SSL_CONNECT_ERROR',
  36 => 'CURLE_BAD_DOWNLOAD_RESUME',
  37 => 'CURLE_FILE_COULDNT_READ_FILE',
  38 => 'CURLE_LDAP_CANNOT_BIND',
  39 => 'CURLE_LDAP_SEARCH_FAILED',
  41 => 'CURLE_FUNCTION_NOT_FOUND',
  42 => 'CURLE_ABORTED_BY_CALLBACK',
  43 => 'CURLE_BAD_FUNCTION_ARGUMENT',
  45 => 'CURLE_INTERFACE_FAILED',
  47 => 'CURLE_TOO_MANY_REDIRECTS',
  48 => 'CURLE_UNKNOWN_OPTION',
  49 => 'CURLE_TELNET_OPTION_SYNTAX',
  51 => 'CURLE_PEER_FAILED_VERIFICATION',
  52 => 'CURLE_GOT_NOTHING',
  53 => 'CURLE_SSL_ENGINE_NOTFOUND',
  54 => 'CURLE_SSL_ENGINE_SETFAILED',
  55 => 'CURLE_SEND_ERROR',
  56 => 'CURLE_RECV_ERROR',
  58 => 'CURLE_SSL_CERTPROBLEM',
  59 => 'CURLE_SSL_CIPHER',
  60 => 'CURLE_SSL_CACERT',
  61 => 'CURLE_BAD_CONTENT_ENCODING',
  62 => 'CURLE_LDAP_INVALID_URL',
  63 => 'CURLE_FILESIZE_EXCEEDED',
  64 => 'CURLE_USE_SSL_FAILED',
  65 => 'CURLE_SEND_FAIL_REWIND',
  66 => 'CURLE_SSL_ENGINE_INITFAILED',
  67 => 'CURLE_LOGIN_DENIED',
  68 => 'CURLE_TFTP_NOTFOUND',
  69 => 'CURLE_TFTP_PERM',
  70 => 'CURLE_REMOTE_DISK_FULL',
  71 => 'CURLE_TFTP_ILLEGAL',
  72 => 'CURLE_TFTP_UNKNOWNID',
  73 => 'CURLE_REMOTE_FILE_EXISTS',
  74 => 'CURLE_TFTP_NOSUCHUSER',
  75 => 'CURLE_CONV_FAILED',
  76 => 'CURLE_CONV_REQD',
  77 => 'CURLE_SSL_CACERT_BADFILE',
  78 => 'CURLE_REMOTE_FILE_NOT_FOUND',
  79 => 'CURLE_SSH',
  80 => 'CURLE_SSL_SHUTDOWN_FAILED',
  81 => 'CURLE_AGAIN',
  82 => 'CURLE_SSL_CRL_BADFILE',
  83 => 'CURLE_SSL_ISSUER_ERROR',
  84 => 'CURLE_FTP_PRET_FAILED',
  85 => 'CURLE_RTSP_CSEQ_ERROR',
  86 => 'CURLE_RTSP_SESSION_ERROR',
  87 => 'CURLE_FTP_BAD_FILE_LIST',
  88 => 'CURLE_CHUNK_FAILED',
  89 => 'CURLE_NO_CONNECTION_AVAILABLE'
);
?>