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How to fix this incompatibility in the code?
When I try to run the test, I get, It's
not clear where the incompatibility with versions is?
php unit -> versions : * 7.0.3
php version (php -v) -> PHP 7.1.7
Error ;
PHP Parse error: syntax error, unexpected '?'
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php unit -> versions : * 7.0.3
php version (php -v) -> PHP 7.1.7
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