How Do I Fix the \'Call to undefined function curl_init()\'?

Troubleshooting "Call to undefined function curl_init()"?

Issue:
When integrating Authorize.net payment gateway, developers encounter the error "Call to undefined function curl_init()".

Resolution:

Windows:

• Locate your php.ini file.

• Remove the semi-colon (;) from the following line:

  ;extension=php_curl.dll

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• Restart your HTTP server (e.g., Apache).

Ubuntu 13.0 and Above:

• Bundled package:

  • Install php-curl:

    sudo apt-get install php-curl

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• Debundled package:

  • Install the debundled package:

    sudo apt-get install php5-curl

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    or

    sudo apt-get install php5.6-curl

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  • Restart Apache:

    sudo service apache2 restart

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