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This PR adds linting of the PHP files in the repo against every supported PHP version to the Travis build.
The
vendor
directory is excluded by default.For PHP 5.2, the
tests/phpunit6-compat.php
file is excluded as it uses namespaces and is only loaded on PHP 7+ anyway.For PHP < 5.4, the
examples/cookie_jar.php
file is excluded as it uses short arrays.