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<?php class Assert { public static function isString($value) : string { if (false === is_string($value)) { throw new Exception('Not string.'); } return __CLASS__; } public static function notEmptyString($value) : string { if ('' === trim($value)) { throw new DomainException('Empty string.'); } return __CLASS__; } } $string = 'test'; $emptyString = ' '; Assert::isString($string)::notEmptyString($string); Assert::isString($emptyString)::notEmptyString($emptyString);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught DomainException: Empty string. in /in/RdVfs:16 Stack trace: #0 /in/RdVfs(27): Assert::notEmptyString(' ') #1 {main} thrown in /in/RdVfs on line 16
Process exited with code 255.

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