Failing php due to changed versions

GuguguBear

Guys, I encountered a strange error.
I recently changed the domain name, and the PHP version has dropped from PHP7.4 to PHP7.3
Then my problem appeared.

[root@CLT_WEB bbs.cltserver.xyz]# composer install
PHP Parse error:  syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /www/wwwroot/bbs.cltserver.xyz/vendor/ocramius/package-versions/src/PackageVersions/Installer.php on line 33

Parse error: syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /www/wwwroot/bbs.cltserver.xyz/vendor/ocramius/package-versions/src/PackageVersions/Installer.php on line 33
[root@CLT_WEB bbs.cltserver.xyz]#

I will switch back to PHP7.4 now too ...

How can I solve this problem?

luceos

GuguguBear when you change php versions you should run composer update. Composer installs code that works on the php version it detects. If you switch it around after installing it might not work. This is especially true with a new version like 7.4 that drops specific code functionality.

GuguguBear

luceos
I tried changing back to PHP7.4 to solve this problem
But it has no effect.

[root@CLT_WEB bbs.cltserver.xyz]# composer update
PHP Parse error:  syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /www/wwwroot/bbs.cltserver.xyz/vendor/ocramius/package-versions/src/PackageVersions/Installer.php on line 33

Parse error: syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /www/wwwroot/bbs.cltserver.xyz/vendor/ocramius/package-versions/src/PackageVersions/Installer.php on line 33
[root@CLT_WEB bbs.cltserver.xyz]#