PHP cURL

Last Updated : 26 Jul, 2021

What is cURL?

cURL, which stands for client URL and can be written as curl (which I’ll do for the remainder of the blog because I’m lazy), is a command-line tool for file transfer with URL syntax.

It supports a number of protocols including HTTP, HTTPS, FTP, and many more. HTTP/HTTPS makes it a great candidate for interacting with APIs.

So there are PHP also supports libcurl. Which allows you to connect and communicate to many different types of servers with many different types of protocols.

libcurl currently supports the http, https, ftp, gopher, telnet, dict, file, and ldap protocols.

libcurl also supports HTTPS certificates, HTTP POST, HTTP PUT, FTP uploading (this can also be done with PHP's FTP extension), HTTP form-based upload, proxies, cookies, and user+password authentication.

An example to fetch a web page via cURL

<?php

// create a new cURL resource
$ch = curl_init();

// set URL and other appropriate options
curl_setopt($ch, CURLOPT_URL, "http://www.example.com/");
curl_setopt($ch, CURLOPT_HEADER, 0);

// grab URL and pass it to the browser
curl_exec($ch);

// close cURL resource, and free up system resources
curl_close($ch);

?>

Output

This will return an end-point out of the given URL

Requirements

In order to use PHP's cURL functions, you need to install the » libcurl package. PHP requires libcurl version 7.10.5 or later.

Installation

To use PHP's cURL support you must also compile PHP --with-curl[=DIR] where DIR is the location of the directory containing the lib and include directories.

In the include directory, there should be a folder named curl which should contain the easy.h and curl.h files.

There should be a file named libcurl.a located in the lib directory.

Beginning with PHP 4.3.0 you can configure PHP to use cURL for URL streams --with-curlwrappers . This feature was moved to PECL as of PHP 5.5.0.

Note: Note to Win32 Users

In order to enable this module on a Windows environment, libeay32.dll and ssleay32.dll, or, as of OpenSSL 1.1 libcrypto-*.dll and libssl-*.dll, must be present in your PATH.

Also, libssh2.dll must be present in your PATH. You don't need libcurl.dll from the cURL site.

Run-time Configuration

The behavior of these functions is affected by settings in php.ini.

cURL Configuration Options

Name	Default	Changeable	Changelog
curl.cainfo	NULL	PHP_INI_SYSTEM	Available since PHP 5.3.7.

Resource Types

This extension defines two resource types: a cURL handle and a cURL multi handle.

Predefined Constants

This extension also provided predefined constants,

In order to use this extension has either been compiled into PHP or will dynamically be loaded at runtime.

CURLOPT_AUTOREFERER (integer)
- Available since PHP 5.1.0
CURLOPT_COOKIESESSION (integer)
- Available since PHP 5.1.0
CURLOPT_DNS_USE_GLOBAL_CACHE (integer)
CURLOPT_DNS_CACHE_TIMEOUT (integer)
CURLOPT_FTP_SSL (integer)
- Available since PHP 5.2.0
CURLFTP_CREATE_DIR (integer)
- Available since PHP 7.0.7 and cURL 7.19.3
CURLFTP_CREATE_DIR_NONE (integer)
- Available since PHP 7.0.7 and cURL 7.19.3
CURLFTP_CREATE_DIR_RETRY (integer)
- Available since PHP 7.0.7 and cURL 7.19.3
CURLFTPSSL_TRY (integer)
- Available since PHP 5.2.0
CURLFTPSSL_ALL (integer)
- Available since PHP 5.2.0
CURLFTPSSL_CONTROL (integer)
- Available since PHP 5.2.0
CURLFTPSSL_NONE (integer)
- Available since PHP 5.2.0
CURLOPT_PRIVATE (integer)
- Available since PHP 5.2.4
CURLOPT_FTPSSLAUTH (integer)
- Available since PHP 5.1.0
CURLOPT_PORT (integer)
CURLOPT_FILE (integer)
CURLOPT_INFILE (integer)
CURLOPT_INFILESIZE (integer)
CURLOPT_URL (integer)
CURLOPT_PROXY (integer)
CURLOPT_VERBOSE (integer)
CURLOPT_HEADER (integer)
CURLOPT_HTTPHEADER (integer)
CURLOPT_NOPROGRESS (integer)
CURLOPT_NOBODY (integer)
CURLOPT_FAILONERROR (integer)
CURLOPT_UPLOAD (integer)
CURLOPT_POST (integer)
CURLOPT_FTPLISTONLY (integer)
CURLOPT_FTPAPPEND (integer)
CURLOPT_FTP_CREATE_MISSING_DIRS (integer)
CURLOPT_NETRC (integer)
CURLOPT_FOLLOWLOCATION (integer)
- This constant is not available when open_basedir or safe_mode are enabled.
CURLOPT_FTPASCII (integer)
CURLOPT_PUT (integer)
CURLOPT_MUTE (integer)
CURLOPT_USERPWD (integer)
CURLOPT_PROXYUSERPWD (integer)
CURLOPT_RANGE (integer)
CURLOPT_TIMEOUT (integer)
CURLOPT_TIMEOUT_MS (integer)
CURLOPT_TCP_NODELAY (integer)
- Available since PHP 5.2.1
CURLOPT_POSTFIELDS (integer)
CURLOPT_PROGRESSFUNCTION (integer)
- Available since PHP 5.3.0
CURLOPT_REFERER (integer)
CURLOPT_USERAGENT (integer)
CURLOPT_FTPPORT (integer)
CURLOPT_FTP_USE_EPSV (integer)
CURLOPT_LOW_SPEED_LIMIT (integer)
CURLOPT_LOW_SPEED_TIME (integer)
CURLOPT_RESUME_FROM (integer)
CURLOPT_COOKIE (integer)
CURLOPT_SSLCERT (integer)
CURLOPT_SSLCERTPASSWD (integer)
CURLOPT_WRITEHEADER (integer)
CURLOPT_SSL_VERIFYHOST (integer)
CURLOPT_COOKIEFILE (integer)
CURLOPT_SSLVERSION (integer)
CURL_SSLVERSION_DEFAULT (integer)
CURL_SSLVERSION_TLSv1 (integer)
CURL_SSLVERSION_SSLv2 (integer)
CURL_SSLVERSION_SSLv3 (integer)
CURL_SSLVERSION_TLSv1_0 (integer)
- Available since PHP 5.5.19 and 5.6.3
CURL_SSLVERSION_TLSv1_1 (integer)
- Available since PHP 5.5.19 and 5.6.3
CURL_SSLVERSION_TLSv1_2 (integer)
- Available since PHP 5.5.19 and 5.6.3
CURLOPT_TIMECONDITION (integer)
CURLOPT_TIMEVALUE (integer)
CURLOPT_CUSTOMREQUEST (integer)
CURLOPT_STDERR (integer)
CURLOPT_TRANSFERTEXT (integer)
CURLOPT_RETURNTRANSFER (integer)
CURLOPT_QUOTE (integer)
CURLOPT_POSTQUOTE (integer)
CURLOPT_INTERFACE (integer)
CURLOPT_KRB4LEVEL (integer)
CURLOPT_HTTPPROXYTUNNEL (integer)
CURLOPT_FILETIME (integer)
CURLOPT_WRITEFUNCTION (integer)
CURLOPT_READFUNCTION (integer)
CURLOPT_PASSWDFUNCTION (integer)
CURLOPT_HEADERFUNCTION (integer)
CURLOPT_MAXREDIRS (integer)
CURLOPT_MAXCONNECTS (integer)
CURLOPT_CLOSEPOLICY (integer)
- Removed in PHP 5.6.0.
CURLOPT_FRESH_CONNECT (integer)
CURLOPT_FORBID_REUSE (integer)
CURLOPT_RANDOM_FILE (integer)
CURLOPT_EGDSOCKET (integer)
CURLOPT_CONNECTTIMEOUT (integer)
CURLOPT_CONNECTTIMEOUT_MS (integer)
CURLOPT_SSL_VERIFYPEER (integer)
CURLOPT_CAINFO (integer)
CURLOPT_CAPATH (integer)
CURLOPT_COOKIEJAR (integer)
CURLOPT_SSL_CIPHER_LIST (integer)
CURLOPT_BINARYTRANSFER (integer)
CURLOPT_NOSIGNAL (integer)
CURLOPT_PROXYTYPE (integer)
- Available as of cURL 7.10.
CURLOPT_BUFFERSIZE (integer)
CURLOPT_HTTPGET (integer)
CURLOPT_HTTP_VERSION (integer)
CURLOPT_SSLKEY (integer)
CURLOPT_SSLKEYTYPE (integer)
CURLOPT_SSLKEYPASSWD (integer)
CURLOPT_SSLENGINE (integer)
CURLOPT_SSLENGINE_DEFAULT (integer)
CURLOPT_SSLCERTTYPE (integer)
CURLOPT_CRLF (integer)
CURLOPT_ENCODING (integer)
CURLOPT_PROXYPORT (integer)
CURLOPT_UNRESTRICTED_AUTH (integer)
CURLOPT_FTP_USE_EPRT (integer)
CURLOPT_HTTP200ALIASES (integer)
CURLOPT_HTTPAUTH (integer)
CURLAUTH_BASIC (integer)
CURLAUTH_DIGEST (integer)
CURLAUTH_GSSNEGOTIATE (integer)
CURLAUTH_NEGOTIATE (integer)
- Available since PHP 7.0.7 and cURL 7.38.0.
CURLAUTH_NTLM (integer)
CURLAUTH_NTLM_WB (integer)
- Available since PHP 7.0.7 and cURL 7.22.0
CURLAUTH_ANY (integer)
CURLAUTH_ANYSAFE (integer)
CURLOPT_PROXYAUTH (integer)
CURLOPT_MAX_RECV_SPEED_LARGE (integer)
- Available since PHP 5.4.0 and cURL 7.15.5
CURLOPT_MAX_SEND_SPEED_LARGE (integer)
- Available since PHP 5.4.0 and cURL 7.15.5
CURLOPT_HEADEROPT (integer)
- Available since PHP 7.0.7 and cURL 7.37.0
CURLOPT_PROXYHEADER (integer)
- Available since PHP 7.0.7 and cURL 7.37.0
CURLCLOSEPOLICY_LEAST_RECENTLY_USED (integer)
- Removed in PHP 5.6.0.
CURLCLOSEPOLICY_LEAST_TRAFFIC (integer)
- Removed in PHP 5.6.0.
CURLCLOSEPOLICY_SLOWEST (integer)
- Removed in PHP 5.6.0.
CURLCLOSEPOLICY_CALLBACK (integer)
- Removed in PHP 5.6.0.
CURLCLOSEPOLICY_OLDEST (integer)
- Removed in PHP 5.6.0.
CURLINFO_PRIVATE (integer)
- Available since PHP 5.2.4
CURLINFO_EFFECTIVE_URL (integer)
CURLINFO_HTTP_CODE (integer)
- As of PHP 5.5.0 and cURL 7.10.8, this is a legacy alias of CURLINFO_RESPONSE_CODE
CURLINFO_RESPONSE_CODE (integer)
- Available since PHP 5.5.0 and cURL 7.10.8
CURLINFO_HEADER_OUT (integer)
- Available since PHP 5.1.3
CURLINFO_HEADER_SIZE (integer)
CURLINFO_REQUEST_SIZE (integer)
CURLINFO_TOTAL_TIME (integer)
CURLINFO_NAMELOOKUP_TIME (integer)
CURLINFO_CONNECT_TIME (integer)
CURLINFO_PRETRANSFER_TIME (integer)
CURLINFO_SIZE_UPLOAD (integer)
CURLINFO_SIZE_DOWNLOAD (integer)
CURLINFO_SPEED_DOWNLOAD (integer)
CURLINFO_SPEED_UPLOAD (integer)
CURLINFO_FILETIME (integer)
CURLINFO_SSL_VERIFYRESULT (integer)
CURLINFO_CONTENT_LENGTH_DOWNLOAD (integer)
CURLINFO_CONTENT_LENGTH_UPLOAD (integer)
CURLINFO_STARTTRANSFER_TIME (integer)
CURLINFO_CONTENT_TYPE (integer)
CURLINFO_REDIRECT_TIME (integer)
CURLINFO_REDIRECT_COUNT (integer)
CURLINFO_REDIRECT_URL (string)
- Available since PHP 5.3.7
CURLINFO_PRIMARY_IP (string)
- Available since PHP 5.4.7
CURLINFO_PRIMARY_PORT (integer)
- Available since PHP 5.4.7
CURLINFO_LOCAL_IP (string)
- Available since PHP 5.4.7
CURLINFO_LOCAL_PORT (integer)
- Available since PHP 5.4.7
CURL_PUSH_OK (integer)
- Available since PHP 7.1.0 and cURL 7.44.0
CURL_PUSH_DENY (integer)
- Available since PHP 7.1.0 and cURL 7.44.0
CURL_REDIR_POST_301 (integer)
- Available since PHP 7.0.7 and cURL 7.18.2
CURL_REDIR_POST_302 (integer)
- Available since PHP 7.0.7 and cURL 7.18.2
CURL_REDIR_POST_303 (integer)
- Available since PHP 7.0.7 and cURL 7.25.1
CURL_REDIR_POST_ALL (integer)
- Available since PHP 7.0.7 and cURL 7.18.2
CURL_TIMECOND_IFMODSINCE (integer)
CURL_TIMECOND_IFUNMODSINCE (integer)
CURL_TIMECOND_LASTMOD (integer)
CURL_VERSION_IPV6 (integer)
CURL_VERSION_KERBEROS4 (integer)
CURL_VERSION_KERBEROS5 (integer)
- Available since PHP 7.0.7 and cURL 7.40.0
CURL_VERSION_HTTP2 (integer)
- Available since PHP 5.5.24 and 5.6.8 and cURL 7.33.0
CURL_VERSION_PSL (integer)
- Available since PHP 7.0.7 and cURL 7.47.0
CURL_VERSION_SSL (integer)
CURL_VERSION_UNIX_SOCKETS (integer)
- Available since PHP 7.0.7 and cURL 7.40.0
CURL_VERSION_LIBZ (integer)
CURLVERSION_NOW (integer)
CURLE_OK (integer)
CURLE_UNSUPPORTED_PROTOCOL (integer)
CURLE_FAILED_INIT (integer)
CURLE_URL_MALFORMAT (integer)
CURLE_URL_MALFORMAT_USER (integer)
CURLE_COULDNT_RESOLVE_PROXY (integer)
CURLE_COULDNT_RESOLVE_HOST (integer)
CURLE_COULDNT_CONNECT (integer)
CURLE_FTP_WEIRD_SERVER_REPLY (integer)
CURLE_FTP_ACCESS_DENIED (integer)
CURLE_FTP_USER_PASSWORD_INCORRECT (integer)
CURLE_FTP_WEIRD_PASS_REPLY (integer)
CURLE_FTP_WEIRD_USER_REPLY (integer)
CURLE_FTP_WEIRD_PASV_REPLY (integer)
CURLE_FTP_WEIRD_227_FORMAT (integer)
CURLE_FTP_CANT_GET_HOST (integer)
CURLE_FTP_CANT_RECONNECT (integer)
CURLE_FTP_COULDNT_SET_BINARY (integer)
CURLE_PARTIAL_FILE (integer)
CURLE_FTP_COULDNT_RETR_FILE (integer)
CURLE_FTP_WRITE_ERROR (integer)
CURLE_FTP_QUOTE_ERROR (integer)
CURLE_HTTP_NOT_FOUND (integer)
CURLE_WRITE_ERROR (integer)
CURLE_MALFORMAT_USER (integer)
CURLE_FTP_COULDNT_STOR_FILE (integer)
CURLE_READ_ERROR (integer)
CURLE_OUT_OF_MEMORY (integer)
CURLE_OPERATION_TIMEOUTED (integer)
CURLE_FTP_COULDNT_SET_ASCII (integer)
CURLE_FTP_PORT_FAILED (integer)
CURLE_FTP_COULDNT_USE_REST (integer)
CURLE_FTP_COULDNT_GET_SIZE (integer)
CURLE_HTTP_RANGE_ERROR (integer)
CURLE_HTTP_POST_ERROR (integer)
CURLE_SSL_CONNECT_ERROR (integer)
CURLE_FTP_BAD_DOWNLOAD_RESUME (integer)
CURLE_FILE_COULDNT_READ_FILE (integer)
CURLE_LDAP_CANNOT_BIND (integer)
CURLE_LDAP_SEARCH_FAILED (integer)
CURLE_LIBRARY_NOT_FOUND (integer)
CURLE_FUNCTION_NOT_FOUND (integer)
CURLE_ABORTED_BY_CALLBACK (integer)
CURLE_BAD_FUNCTION_ARGUMENT (integer)
CURLE_BAD_CALLING_ORDER (integer)
CURLE_HTTP_PORT_FAILED (integer)
CURLE_BAD_PASSWORD_ENTERED (integer)
CURLE_TOO_MANY_REDIRECTS (integer)
CURLE_UNKNOWN_TELNET_OPTION (integer)
CURLE_TELNET_OPTION_SYNTAX (integer)
CURLE_OBSOLETE (integer)
CURLE_SSL_PEER_CERTIFICATE (integer)
CURLE_GOT_NOTHING (integer)
CURLE_SSL_ENGINE_NOTFOUND (integer)
CURLE_SSL_ENGINE_SETFAILED (integer)
CURLE_SEND_ERROR (integer)
CURLE_RECV_ERROR (integer)
CURLE_SHARE_IN_USE (integer)
CURLE_SSL_CERTPROBLEM (integer)
CURLE_SSL_CIPHER (integer)
CURLE_SSL_CACERT (integer)
CURLE_BAD_CONTENT_ENCODING (integer)
CURLE_LDAP_INVALID_URL (integer)
CURLE_FILESIZE_EXCEEDED (integer)
CURLE_FTP_SSL_FAILED (integer)
CURLE_SSH (integer)
- Available since PHP 5.3.0 and cURL 7.16.1.
CURLFTPAUTH_DEFAULT (integer)
- Available since PHP 5.1.0
CURLFTPAUTH_SSL (integer)
- Available since PHP 5.1.0
CURLFTPAUTH_TLS (integer)
- Available since PHP 5.1.0
CURLPROXY_HTTP (integer)
- Available since cURL 7.10.
CURLPROXY_HTTP_1_0 (integer)
- Available since PHP 7.0.7 and cURL 7.19.3
CURLPROXY_SOCKS4 (integer)
- Available since PHP 5.2.10 and cURL 7.10.
CURLPROXY_SOCKS5 (integer)
- Available since cURL 7.10.
CURL_NETRC_OPTIONAL (integer)
CURL_NETRC_IGNORED (integer)
CURL_NETRC_REQUIRED (integer)
CURL_HTTP_VERSION_NONE (integer)
CURL_HTTP_VERSION_1_0 (integer)
CURL_HTTP_VERSION_1_1 (integer)
CURL_HTTP_VERSION_2 (integer)
- Available since PHP 7.0.7 and cURL 7.43.0
CURL_HTTP_VERSION_2TLS (integer)
- Available since PHP 7.0.7 and cURL 7.47.0
CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE (integer)
- Available since PHP 7.0.7 and cURL 7.49.0
CURLM_CALL_MULTI_PERFORM (integer)
CURLM_OK (integer)
CURLM_BAD_HANDLE (integer)
CURLM_BAD_EASY_HANDLE (integer)
CURLM_OUT_OF_MEMORY (integer)
CURLM_INTERNAL_ERROR (integer)
CURLMSG_DONE (integer)
CURLOPT_KEYPASSWD (integer)
CURLOPT_SSH_AUTH_TYPES (integer)
CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 (integer)
CURLOPT_SSH_PRIVATE_KEYFILE (integer)
CURLOPT_SSH_PUBLIC_KEYFILE (integer)
CURLOPT_SSL_OPTIONS (integer)
- Available since PHP 5.5.0 and cURL 7.25.0
CURLSSLOPT_ALLOW_BEAST (integer)
- Available since PHP 5.5.0 and cURL 7.25.0
CURLSSLOPT_NO_REVOKE (integer)
- Available since PHP 7.0.7 and cURL 7.44.0
CURLOPT_USERNAME (integer)
- Available since PHP 5.5.0 and cURL 7.19.1
CURLOPT_SASL_IR (integer)
- Available since PHP 7.0.7 and cURL 7.31.0
CURLOPT_DNS_INTERFACE (integer)
- Available since PHP 7.0.7 and cURL 7.33.0
CURLOPT_DNS_LOCAL_IP4 (integer)
- Available since PHP 7.0.7 and cURL 7.33.0
CURLOPT_DNS_LOCAL_IP6 (integer)
- Available since PHP 7.0.7 and cURL 7.33.0
CURLOPT_XOAUTH2_BEARER (integer)
- Available since PHP 7.0.7 and cURL 7.33.0
CURLOPT_LOGIN_OPTIONS (integer)
- Available since PHP 7.0.7 and cURL 7.34.0
CURLOPT_EXPECT_100_TIMEOUT_MS (integer)
- Available since PHP 7.0.7 and cURL 7.36.0
CURLOPT_SSL_ENABLE_ALPN (integer)
- Available since PHP 7.0.7 and cURL 7.36.0
CURLOPT_SSL_ENABLE_NPN (integer)
- Available since PHP 7.0.7 and cURL 7.36.0
CURLOPT_PINNEDPUBLICKEY (integer)
- Available since PHP 7.0.7 and cURL 7.39.0
CURLOPT_UNIX_SOCKET_PATH (integer)
- Available since PHP 7.0.7 and cURL 7.40.0
CURLOPT_SSL_VERIFYSTATUS (integer)
- Available since PHP 7.0.7 and cURL 7.41.0
CURLOPT_PATH_AS_IS (integer)
- Available since PHP 7.0.7 and cURL 7.42.0
CURLOPT_SSL_FALSESTART (integer)
- Available since PHP 7.0.7 and cURL 7.42.0
CURLOPT_PIPEWAIT (integer)
- Available since PHP 7.0.7 and cURL 7.43.0
CURLOPT_PROXY_SERVICE_NAME (integer)
- Available since PHP 7.0.7 and cURL 7.43.0
CURLOPT_SERVICE_NAME (integer)
- Available since PHP 7.0.7 and cURL 7.43.0
CURLOPT_DEFAULT_PROTOCOL (integer)
- Available since PHP 7.0.7 and cURL 7.45.0
CURLOPT_STREAM_WEIGHT (integer)
- Available since PHP 7.0.7 and cURL 7.46.0
CURLOPT_TFTP_NO_OPTIONS (integer)
- Available since PHP 7.0.7 and cURL 7.48.0
CURLOPT_CONNECT_TO (integer)
- Available since PHP 7.0.7 and cURL 7.49.0
CURLOPT_TCP_FASTOPEN (integer)
- Available since PHP 7.0.7 and cURL 7.49.0
CURLMOPT_PIPELINING (integer)
- Available since PHP 5.5.0 and cURL 7.16.0.
CURLMOPT_MAXCONNECTS (integer)
- Available since PHP 5.5.0 and cURL 7.16.3.
CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE (integer)
- Available since PHP 7.0.7 and cURL 7.30.0
CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE (integer)
- Available since PHP 7.0.7 and cURL 7.30.0
CURLMOPT_MAX_HOST_CONNECTIONS (integer)
- Available since PHP 7.0.7 and cURL 7.30.0
CURLMOPT_MAX_PIPELINE_LENGTH (integer)
- Available since PHP 7.0.7 and cURL 7.30.0
CURLMOPT_MAX_TOTAL_CONNECTIONS (integer)
- Available since PHP 7.0.7 and cURL 7.30.0
CURLMOPT_PUSHFUNCTION (integer)
- Available since PHP 7.1.0 and cURL 7.44.0
CURLSSH_AUTH_AGENT (integer)
- Available since PHP 7.0.7 and cURL 7.28.0
CURLSSH_AUTH_ANY (integer)
CURLSSH_AUTH_DEFAULT (integer)
CURLSSH_AUTH_HOST (integer)
CURLSSH_AUTH_KEYBOARD (integer)
CURLSSH_AUTH_NONE (integer)
CURLSSH_AUTH_PASSWORD (integer)
CURLSSH_AUTH_PUBLICKEY (integer)
CURL_WRAPPERS_ENABLED (integer)
- Defined if PHP was configured with --with-curlwrappers . Moved to PECL in PHP 5.5.0.
CURLPAUSE_ALL (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPAUSE_CONT (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPAUSE_RECV (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPAUSE_RECV_CONT (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPAUSE_SEND (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPAUSE_SEND_CONT (integer)
- Available since PHP 5.5.0 and cURL 7.18.0.
CURLPIPE_NOTHING (integer)
- Available since PHP 7.0.0 and cURL 7.43.0.
CURLPIPE_HTTP1 (integer)
- Available since PHP 7.0.0 and cURL 7.43.0.
CURLPIPE_MULTIPLEX (integer)
- Available since PHP 7.0.0 and cURL 7.43.0.
CURLPROXY_SOCKS4A (integer)
- Available since PHP 5.5.23 and PHP 5.6.7 and cURL 7.18.0.
CURLPROXY_SOCKS5_HOSTNAME (integer)
- Available since PHP 5.5.23 and PHP 5.6.7 and cURL 7.18.0.
CURLHEADER_SEPARATE (integer)
- Available since PHP 7.0.7 and cURL 7.37.0.
CURLHEADER_UNIFIED (integer)
- Available since PHP 7.0.7 and cURL 7.37.0.
CURLPROTO_SMB (integer)
- Available since PHP 7.0.7 and cURL 7.40.0.
CURLPROTO_SMBS (integer)
- Available since PHP 7.0.7 and cURL 7.40.0.

cURL Functions

curl_close — Close a cURL session
curl_copy_handle — Copy a cURL handle along with all of its preferences
curl_errno — Return the last error number
curl_error — Return a string containing the last error for the current session
curl_escape — URL encodes the given string
curl_exec — Perform a cURL session
curl_file_create — Create a CURLFile object
curl_getinfo — Get information regarding a specific transfer
curl_init — Initialize a cURL session
curl_multi_add_handle — Add a normal cURL handle to a cURL multi handle
curl_multi_close — Close a set of cURL handles
curl_multi_errno — Return the last multi curl error number
curl_multi_exec — Run the sub-connections of the current cURL handle
curl_multi_getcontent — Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set
curl_multi_info_read — Get information about the current transfers
curl_multi_init — Returns a new cURL multi handle
curl_multi_remove_handle — Remove a multi handle from a set of cURL handles
curl_multi_select — Wait for activity on any curl_multi connection
curl_multi_setopt — Set an option for the cURL multi handle
curl_multi_strerror — Return string describing error code
curl_pause — Pause and unpause a connection
curl_reset — Reset all options of a libcurl session handle
curl_setopt_array — Set multiple options for a cURL transfer
curl_setopt — Set an option for a cURL transfer
curl_share_close — Close a cURL share handle
curl_share_errno — Return the last share curl error number
curl_share_init — Initialize a cURL share handle
curl_share_setopt — Set an option for a cURL share handle
curl_share_strerror — Return string describing the given error code
curl_strerror — Return string describing the given error code
curl_unescape — Decodes the given URL encoded string
curl_version — Gets cURL version information

cURL Predefined Classes

CURLFile: CURLFile should be used to upload a file with CURLOPT_POSTFIELDS.
- CURLFile::__construct — Create a CURLFile object
- CURLFile::getFilename — Get file name
- CURLFile::getMimeType — Get MIME type
- CURLFile::getPostFilename — Get file name for POST
- CURLFile::setMimeType — Set MIME type
- CURLFile::setPostFilename — Set file name for POST
- CURLFile::__wakeup — Unserialization handler