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<?php function guessObjectMethod($object, string $fieldName, string $prefix): ?string { if (\is_callable([$object, $method = $prefix.\str_replace(' ', '', \ucwords(\str_replace('_', ' ', $fieldName)))])) { return $method; } return null; } class Data { public function isValid() : bool { return true; } } $data = new Data(); var_dump(guessObjectMethod($data, 'valid', 'get')); var_dump(guessObjectMethod($data, 'isValid', 'get')); var_dump(guessObjectMethod($data, 'valid', 'is')); var_dump(guessObjectMethod($data, 'isValid', 'is')); // if my property is called `isValid` it won't work!
Output for git.master, git.master_jit, rfc.property-hooks
NULL NULL string(7) "isValid" NULL

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