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<?php var_dump( (string) true, filter_var(true, FILTER_VALIDATE_INT), (string) false, filter_var(false, FILTER_VALIDATE_INT), (string) 1.1, filter_var(1.1, FILTER_VALIDATE_INT), (string) 0.0, filter_var(0.0, FILTER_VALIDATE_INT), (string) '0.0nb', filter_var('0.0', FILTER_VALIDATE_INT), (string) '-0.0', filter_var('-0.0', FILTER_VALIDATE_INT) );
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "1" int(1) string(0) "" bool(false) string(3) "1.1" bool(false) string(1) "0" int(0) string(5) "0.0nb" bool(false) string(4) "-0.0" bool(false)

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