Fatal Error: composer.lock was created for PHP version 7.4 or higher but the current PHP version is 7.3.11

Question

I want to create a Symfony CRUD application. These are the steps I did:

• Downloaded and installed XAMPP from here with PHP 7.3.11 https://www.apachefriends.org/

Answer 1

With 2 PHP versions installed, most likely you forgot to change the etc / hosts file for the test domain. Or you need to edit the DNS.

//file etc/hosts
#old host -forgot to delete
127.0.0.71 demo.symfony.local 
#new host
127.0.0.74 demo.symfony.local

I don't know how the XAMPP installer works, (since I usually manually install and configure), but I can assume that most likely when installing a new XAMPP, it changed the paths in the PATH variable (why the console works with version 7.4), and added hosts to the etc / hosts file but did not remove the old hosts (so the site works with old version).

In my case, PHP versions are separated by IP. If you have 2 PHP versions on one IP, then you will have to stop one of them in order to start another or separate the versions by ports. Otherwise, conflict of interest.
example

#httpd.conf -Apache settings (Apache folder for PHP 7.3)
Listen 127.0.0.1:80

#httpd.conf -Apache settings (Apache folder for PHP 7.4)
Listen 127.0.0.1:80

# etc/hosts
127.0.0.1 localhost

Result: localhost will contact the one who first occupied port 127.0.0.1:80 in the listening queue.