Curl_setopt function usage explanation

The most important function in the CURL function library is curl_setopt(), which can customize the HTTP request by setting the options defined by the CURL function library

Usage:
bool curl_setopt (int ch, string option, mixed value)
curl_setopt() function will set options for a CURL session. The option parameter is the setting you want, and value is the value given by this option.

The values ​​of the following options will be used as long integers (specified in the option parameter):

CURLOPT_INFILESIZE: //When you upload a file to the remote site, this options tells PHP the size of the file you upload.

CURLOPT_VERBOSE: //If you want CURL to report every unexpected thing, set this option to a non-zero value.

CURLOPT_HEADER: //If you want to include a header in the output, set this option to a non-zero value.

CURLOPT_NOPROGRESS: //If you do not want PHP to display a progress bar for CURL transfers, set this option to a non-zero value.
NOTE: PHP automatically sets this option to a non-zero value, you should only change this option for debugging purposes.

CURLOPT_NObody: //If you do not want to include the body part in the output, set this option to a non-zero value.

CURLOPT_FAILONERROR: //If you want PHP not to display when an error occurs (HTTP code return greater than or equal to 300), set this option to a non-zero value. The default behavior is to return a normal page and ignore the code.

CURLOPT_UPLOAD: //If you want PHP to prepare for uploading, set this option to a non-zero value.

CURLOPT_POST: //If you want PHP to do a regular HTTP POST, set this option to a non-zero value. This POST is an ordinary application/x-www-from-urlencoded type, mostly used by HTML forms

CURLOPT_FTPLISTONLY: //Set this option to a non-zero value, PHP will list FTP list of directory names.

CURLOPT_FTPAPPEND: //Set this option to a non-zero value and PHP will apply the remote file instead of overwriting it.

CURLOPT_NETRC: //Set this option to a non-zero value and PHP will look in your ~./netrc file for the username and password of the remote site you want to connect to.

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CURLOPT_FOLLOWLOCATION: //Set this option to a non-zero header (like 'Location: ') and the server will send it as part of the HTTP header (note that this is recursive, PHP will send it as 'Location: ' header).

CURLOPT_PUT: //Set this option to a non-zero value to upload a file using HTTP. To upload this file, the CURLOPT_INFILE and CURLOPT_INFILESIZE options must be set.

CURLOPT_MUTE: //Set this option to a non-zero value, and PHP will be completely silent for the CURL function.
CURLOPT_TIMEOUT: //Set a long integer as the maximum number of seconds.
CURLOPT_LOW_SPEED_LIMIT: //Set a long integer to control how many bytes are transmitted.
CURLOPT_LOW_SPEED_TIME: //Set a long integer to control how many seconds to transmit the number of bytes specified by CURLOPT_LOW_SPEED_LIMIT.

CURLOPT_RESUME_FROM: //Pass a long parameter containing the byte offset address (the start form you want to transfer to).

CURLOPT_SSLVERSION: //Pass a long parameter containing the SSL version. By default PHP will do its own hard work, in more security you have to set it manually.

CURLOPT_TIMECONDITION: //Pass a long parameter to specify how to handle the CURLOPT_TIMEVALUE parameter. You can set this parameter to TIMECOND_IFMODSINCE or TIMECOND_ISUNMODSINCE. This is only for HTTP.

CURLOPT_TIMEVALUE: //Pass a number of seconds from 1970-1-1 to now. This time will be used as the specified value by the CURLOPT_TIMEVALUE option, or by the default TIMECOND_IFMODSINCE.

The values ​​of the following options will be treated as strings:

CURLOPT_URL: //This is the URL address you want to retrieve using PHP. You can also set this option during initialization with the curl_init() function.

CURLOPT_USERPWD: // Pass a string in the form of [username]:[password] and use PHP to connect.

CURLOPT_PROXYUSERPWD: //Pass a string in the format [username]:[password] to connect to the HTTP proxy.

CURLOPT_RANGE: //Pass a range you want to specify. It should be in 'X-Y' format, with X or Y being excluded. HTTP transfers also support several intervals, separated by commas (X-Y,N-M).

CURLOPT_POSTFIELDS: // Pass a string containing all data as an HTTP "POST" operation.

CURLOPT_REFERER: //A string containing a 'referer' header in the HTTP request.

CURLOPT_USERAGENT: //A string containing a 'user-agent' header in the HTTP request.

CURLOPT_FTPPORT: // Pass an IP address containing the IP address used by the ftp 'POST' command. This POST instruction tells the remote server to connect to the IP address we specified. This string can be an IP address, a host name, a network interface name (under UNIX), or '-' (use the system default IP address).

CURLOPT_COOKIE: // Pass a header connection containing an HTTP cookie.

CURLOPT_SSLCERT: //Pass a string containing the PEM format certificate.

CURLOPT_SSLCERTPASSWD: //Pass a password containing the necessary password to use the CURLOPT_SSLCERT certificate.

CURLOPT_COOKIEFILE: // Pass a string containing the name of the file containing cookie data. This cookie file can be in Netscape format, or it can be a stack of HTTP-style headers stored in the file.

CURLOPT_CUSTOMREQUEST: //When making an HTTP request, pass a character to be used by GET or HEAD. It is helpful to perform DELETE or other operations

Note: Do not do this before making sure your server supports the command.

The following options require a file description (obtained by using the fopen() function):

CURLOPT_FILE: //This file will be the output file you place the transfer, The default is STDOUT.

CURLOPT_INFILE: //This file is the input file you sent.

CURLOPT_WRITEHEADER: //This file contains the header part of your output.

CURLOPT_STDERR:// This file has an error written instead of stderr.