Php with curl linux

How to Install PHP Curl Extension in Ubuntu?

In this tutorial, we will go over the demonstration of how to install php curl extension in ubuntu. This post will give you a simple example of ubuntu php install curl extension. I’m going to show you about install php curl extension ubuntu 20.04. you will learn install php curl extension ubuntu.

We can install php curl extension using php-curl library. i will give you following list of commands to install php curl extension in ubuntu 22.10, ubuntu 22.04, ubuntu 21.10, ubuntu 21.04, ubuntu 20.04, ubuntu 18.04 and ubuntu 16.04 server.

You need to run both command one by one:

sudo apt-get install php-curl

Solution for PHP 8.2

You need to run both command one by one:

sudo apt-get install php8.2-curl

Solution for PHP 8.1

You need to run both command one by one:

sudo apt-get install php8.1-curl

Solution for PHP 8.0

You need to run both command one by one:

sudo apt-get install php8.0-curl

Solution for PHP 7.4

You need to run both command one by one:

sudo apt-get install php7.4-curl

Solution for PHP 7.3

You need to run both command one by one:

sudo apt-get install php7.3-curl

Solution for PHP 7.2

You need to run both command one by one:

sudo apt-get install php7.2-curl

Hardik Savani

I’m a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.

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Use of cURL Functions in PHP

cURL is a library to transfer information by using different types of protocols. The full form of cURL is the Client for URL. Two types of libraries exist for cURL. One library is curl that is a command-line tool, and it is used to send or receive files using URL. HTTP, HTTPS, FTP, FTPS, TELNET, FILE, etc., protocols are supported by curl. Another library is libcurl that is introduced by Daniel Stenberg in 1997. It is used to connect and communicate with different types of servers by using different types of protocols. All protocols of curl are supported by libcurl also. Without these protocols, libcurl supports HTTP POST, HTTP PUT, HTTPS certificates, FTP uploading, HTTP based upload, HTTP proxy tunnelling, authentication, etc. The article shows the uses of curl functions of the cURL library using PHP script.

PHP/cURL

The PHP module that is used to access the features of the libcurl library is called PHP/cURL. You have to check this is enabled or not in PHP before testing the examples of this tutorial. You can execute the phpinfo() function to check this module is enabled or not in PHP.

If the module is not enabled by default in PHP, then run the following commands to install and enable the php-curl on Ubuntu and restart the Apache server.

Mostly used curl functions

Function Name	Purpose
curl_init()	It is used to initialize a cURL session.
curl_exec()	It is used to executes the started cURL session.
curl_close()	It is used to close a cURL session.
curl_error()	It is used to return the last error message of the current cURL session.
curl_errno	It is used to return the last error number of the current cURL session.
curl_setopt()	It is used to set an option for a cURL transfer.
curl_setopt_array()	It is used to set multiple options for a cURL transfer.
curl_reset()	It is used to reset all options of a libcurl session.
curl_pause()	It is used to pause a connection.
curl_version()	It is used to get the information of the cURL version.

Example 1: Retrieve the information from any URL address

Create a PHP file with the following script to retrieve the information from a particular URL address. curl_init() function is used here to initialize the cURL session for the defined URL address. The first curl_setopt() function is used to return the page content of the defined URL address. 1 is passed as the third argument value of this function to return the page content as a string value. Next, the second curl_setopt() function is used to omit the header information from the output. curl_exec() function will execute the cURL session and store the return value into $result variable that will be printed later.

//Initialize the cURL session
$ch = curl_init ( «https://linuxhint.com/» ) ;

//Return the page content
curl_setopt ( $ch , CURLOPT_RETURNTRANSFER , 1 ) ;

//Remove the header information from the output
curl_setopt ( $ch , CURLOPT_HEADER , 0 ) ;

//Execute the cURL session
$result = curl_exec ( $ch ) ;

//Print the returned value of the website
echo $result ;

//Close the cURL session
curl_close ( $ch ) ;

The following output will appear after running the above script. “https://linuxhint.com” is given as a URL address in the script. So, the content of this site is displayed.

Example 2: Write the cURL output in a file

In the previous example, the output of the script is shown in the browser. But you can store the return value of any URL address in a file also by using cURL. Create a PHP file with the following script to take the URL address by using an HTML form and initialize the cURL session for that URL and store the page content into a text file rather than displaying it in the browser. CURLOPT_FILE option is used in curl_setopt() function to store the output after executing the cURL session into output.txt file. If the invalid URL address is submitted by the form, then the error information will be written in the file in place of the page content.

//Check the submit button is pressed or not
if ( isset ( $_GET [ ‘url’ ] ) )
{
//Check the url is empty or not
if ( $_GET [ ‘url’ ] != «» )
{
//Set the URL value
$url = $_GET [ ‘url’ ] ;

//Initialize the cURL session
$ch = curl_init ( $url ) ;

//Open file handler to write in a text file
$fh = fopen ( «output.txt» , «w» ) ;

//Set option for writing the output in aa file
curl_setopt ( $ch , CURLOPT_FILE , $fh ) ;

//Include header information in a file
curl_setopt ( $ch , CURLOPT_HEADER , 1 ) ;

//Execute the cURL session
curl_exec ( $ch ) ;

//Check for any cURL error
if ( curl_error ( $ch ) ) {
$error = curl_errno ( $ch ) . » : » . curl_error ( $ch ) ;
fwrite ( $fh , $error ) ;
}

echo «The output of the cURL session has been written in output.txt
file» ;

//Close the cURL session
curl_close ( $ch ) ;
//Close the file
fclose ( $fh ) ;
}
else
{
echo «No URL address is set.» ;
}
}

The following form will be appeared after running the script. Here, a valid URL address is given as the URL address.

The following output will appear after running the pressing the submit button.

Example 3: Set cURL option using the array

If you want to set multiple cURL options at the time of executing the cURL session, then you have to use the curl_setopt_array() function. Create a PHP file with the following script to know the use of this function. Two cURL options are set using an array variable, and this variable is passed as an option variable of the curl_setopt_array() function.

//Define the array of options
$defaults = array (
CURLOPT_URL => ‘http://example.com/’ ,
CURLOPT_POST => true
) ;

//Initialize the cURL session
$ch = curl_init ( ) ;

//Return the page content based on option array
curl_setopt_array ( $ch , $defaults ) ;

//Print the returned value
echo curl_exec ( $ch ) ;

The following output will appear after running the script. “http://example.com” is given as a URL address in the script.

Conclusion

The simple uses of cURL in PHP are shown in this tutorial by using various examples. Many built-in cURL functions exist in PHP to do different types of tasks. This tutorial will help the readers to know the basic uses of cURL in PHP.

About the author

Fahmida Yesmin

I am a trainer of web programming courses. I like to write article or tutorial on various IT topics. I have a YouTube channel where many types of tutorials based on Ubuntu, Windows, Word, Excel, WordPress, Magento, Laravel etc. are published: Tutorials4u Help.

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Compiling php with curl, where is curl installed?

removed /usr/share/. and other irrelevant files UPDATE Tried —with-curl=/usr/lib64 and —with-curl=/usr/lib although I’m pretty sure it’s 64 bit.

checking for cURL support. yes checking if we should use cURL for url streams. no checking for cURL in default path. not found configure: error: Please reinstall the libcurl distribution - easy.h should be in /include/curl/ 

for 64 bit ubuntu 17.** and after, curl is moved to /usr/include/x86_64-linux-gnu/curl, so just make a symlink cd /usr/include sudo ln -s x86_64-linux-gnu/curl

5 Answers 5

None of these will allow you to compile PHP with cURL enabled.

In order to compile with cURL, you need libcurl header files (.h files). They are usually found in /usr/include/curl . They generally are bundled in a separate development package.

Per example, to install libcurl in Ubuntu:

sudo apt-get install libcurl4-gnutls-dev 

sudo yum install curl-devel 

./configure --with-curl # other options. 

If you compile cURL manually, you can specify the path to the files without the lib or include suffix. (e.g.: /usr/local if cURL headers are in /usr/local/include/curl ).

@gAMBOOKa: Always keep in mind when compiling PHP (or any C program that is), that you will need the appropriate devel packages for any extension you want to compile that uses an external library.

libcurl4-gnutls-dev package DOES NOT include curl headers, you need to install libcurl4-openssl-dev instead: $sudo apt-get install libcurl4-openssl-dev

Adding to @netcoder answer above, If you are using Ubuntu 17+, installing libcurl header files is half of the solution. The installation path in ubuntu 17.0+ is different than the installation path in older Ubuntu version. After installing libcurl, you will still get the «cURL not found» error. You need to perform one extra step (as suggested by @minhajul in the OP comment section).

Add a symlink in /usr/include of the cURL installation folder (cURL installation path in Ubuntu 17.0.4 is /usr/include/x86_64-linux-gnu/curl).

My server was running Ubuntu 17.0.4, the commands to enable cURL support were

sudo apt-get install libcurl4-gnutls-dev 

Then create a link to cURL installation

cd /usr/include sudo ln -s x86_64-linux-gnu/curl 

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