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Fix PHP testVersion from 5.4 to 5.6
Fix comment
Remove anonymous function
Since PHP cannot serialize anonymous functions.
@see https://core.trac.wordpress.org/ticket/50482
@see Serialization of 'Closure' is not allowed exception when run tests in process isolation mode sebastianbergmann/phpunit#2739
Add annotation to disable preserve global state
This is temporary avoidance measure.
Since WordPress 5.5 cause
Uncaught Exception: Serialization of 'Closure' is not allowed
when run PHPUnit in plugin development.
@see https://core.trac.wordpress.org/ticket/50482#comment:7
Add IDE settings into .gitignore entry