CURL, Client URL Library Functions

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# XII. CURL, Client URL Library Functions

# Einführung

PHP supports libcurl, a library created by Daniel Stenberg, that 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.

These functions have been added in PHP 4.0.2.

# Anforderungen

In order to use the CURL functions you need to install the CURL package. PHP requires that you use CURL 7.0.2-beta or higher. PHP will not work with any version of CURL below version 7.0.2-beta. From PHP version 4.2.3 you will atleast need CURL version 7.9.0 or higher.

# 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.

# Vordefinierte Konstanten

Folgende Konstanten werden von dieser Erweiterung definiert und stehen nur zur Verfügung, wenn die Erweiterung entweder statisch in PHP kompiliert oder dynamisch zur Laufzeit geladen wurde.

`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_NETRC` (integer)

`CURLOPT_FOLLOWLOCATION` (integer)

`CURLOPT_FTPASCII` (integer)

`CURLOPT_PUT` (integer)

`CURLOPT_MUTE` (integer)

`CURLOPT_USERPWD` (integer)

`CURLOPT_PROXYUSERPWD` (integer)

`CURLOPT_RANGE` (integer)

`CURLOPT_TIMEOUT` (integer)

`CURLOPT_POSTFIELDS` (integer)

`CURLOPT_REFERER` (integer)

`CURLOPT_USERAGENT` (integer)

`CURLOPT_FTPPORT` (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)

`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)

`CURLOPT_FRESH_CONNECT` (integer)

`CURLOPT_FORBID_REUSE` (integer)

`CURLOPT_RANDOM_FILE` (integer)

`CURLOPT_EGDSOCKET` (integer)

`CURLOPT_CONNECTTIMEOUT` (integer)

`CURLOPT_SSL_VERIFYPEER` (integer)

`CURLOPT_CAINFO` (integer)

`CURLOPT_COOKIEJAR` (integer)

`CURLOPT_SSL_CIPHER_LIST` (integer)

`CURLOPT_BINARYTRANSFER` (integer)

`CURLCLOSEPOLICY_LEAST_RECENTLY_USED` (integer)

`CURLCLOSEPOLICY_LEAST_TRAFFIC` (integer)

`CURLCLOSEPOLICY_SLOWEST` (integer)

`CURLCLOSEPOLICY_CALLBACK` (integer)

`CURLCLOSEPOLICY_OLDEST` (integer)

`CURLINFO_EFFECTIVE_URL` (integer)

`CURLINFO_HTTP_CODE` (integer)

`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)

`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)

# Beispiele

Once you've compiled PHP with CURL support, you can begin using the curl functions. The basic idea behind the CURL functions is that you initialize a CURL session using the curl_init(), then you can set all your options for the transfer via the curl_exec() and then you finish off your session using the curl_close(). Here is an example that uses the CURL functions to fetch the example.com homepage into a file:

Beispiel 1. Using PHP's CURL module to fetch the example.com homepage
    <?php

    $ch = curl_init ("http://www.example.com/");
    $fp = fopen ("example_homepage.txt", "w");

    curl_setopt ($ch, CURLOPT_FILE, $fp);
    curl_setopt ($ch, CURLOPT_HEADER, 0);

    curl_exec ($ch);
    curl_close ($ch);
    fclose ($fp);
    ?>

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