Magento 2.3 PHP Parse error unexpected '?' in write.php

Question

I want to Install cron with putty SSH. I use php bin/magento cron:install [--force] and get this error:

PHP Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /www/htdocs/xxx/xxx/xxx/vendor/magento/framework/Filesystem/Directory/Write.php on line 35

Server run with PHP Version 7.2.11-nmm1. What can I do? Where I can begin to search for it?

Answer 1

It seems your php version does not parse correctly Nullable types (such as that ?PathValidatorInterface), which were introduced in php7.1 http://php.net/manual/en/migration71.new-features.php

public function __construct(
 \Magento\Framework\Filesystem\File\WriteFactory $fileFactory,
 \Magento\Framework\Filesystem\DriverInterface $driver,
 $path,
 $createPermissions = null,
 ?PathValidatorInterface $pathValidator = null
) {
 parent::__construct($fileFactory, $driver, $path, $pathValidator);
 if (null !== $createPermissions) {
 $this->permissions = $createPermissions;
 }
}

Double check your php version in command line, as it does not seem to be 7.2

It is not rare to have more than 1 php version installed, for instance https://stackoverflow.com/a/50591861/1073040

• Marcel: Yes I checked: PHPinfo.php detect: the 7.2 Version and if I check with: "php -version in SSH i get the info : 7.0.32. Where I can change the version to 7.2?
• Raul Sanchez: You'd uninstall or disable 7.0... the way to do that would depend by the operative system you use. If you are in a Unix server & using Apache as webserver I have referenced an example for it