php-curl and php7.3-curl installed but curl_init() is "undefined function" (Debian buster)

Question

I have a problem with my web server since upgrading to buster. PHP doesn't seem to see the curl library :

root@myserver ~ # php -r "curl_init();" PHP Fatal error: Uncaught Error: Call to undefined function curl_init() in Command line code:1 Stack trace: #0 {main} thrown in Command line code on line 1 root@myserver ~ # apt-get install php-curl Reading package lists... Done Building dependency tree Reading state information... Done php-curl is already the newest version (2:7.3+69). 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. root@myserver ~ # apt-get install php7.3-curl Reading package lists... Done Building dependency tree Reading state information... Done php7.3-curl is already the newest version (7.3.14-1~deb10u1). 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. root@myserver ~ # root@myserver ~ # php --version PHP 7.0.33-1~dotdeb+8.1 (cli) ( NTS ) Copyright (c) 1997-2017 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies with Zend OPcache v7.0.33-1~dotdeb+8.1, Copyright (c) 1999-2017, by Zend Technologies 

Must be something very silly, but what?

Answer 1

You have php7.3-curl for PHP 7.3, but your PHP CLI is PHP 7.0 7.0.33-1~dotdeb+8.1 from Zend OPcache.

Do you have php7.3-cli installed? If not, then

sudo apt install php7.3-cli