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Cannot install composer on my Drupal 7 server

I am trying to install composer to prepare my Linux Drupal 7 server for migration to Drupal 9. I am following the instructions here: https://www.hostinger.com/tutorials/how-to-install-composer and I run the first command:

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

…and I get the error:

PHP Warning:  copy(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed in  Command line code on line 1 PHP Warning:  copy(): Failed to enable crypto in Command line code on line 1 PHP Warning:  copy(https://getcomposer.org/installer): failed to open stream: operation  failed in Command line code on line 1

I tried installing a new cacert.pem file, that didn’t work. I am still getting the error. Please advise.

This article was republished from its original source.
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Cannot install composer on my Drupal 7 server

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