返回，内部或外部尝试/捕获? [英] Return, inside or outside Try / catch?

问题描述

在下面的代码中，IDE 会在最后一个括号中提醒我缺少返回语句".这让我在这里问 try{} 内的返回是否正常或应该在它之外.

In the below code, the IDE alerts me about "Missing return statement" in the last bracket. Which leads me to ask here if the return inside the try{} is ok or should be outside it.

非常感谢.

public function getFileNamesFromKeywords( array $ids, $format ) {
    try {
      if(self::$dbLink) {
        $ids = implode(',',$ids);
        $query = 'SELECT d.id, d.wfid, d.docid , k.keyword, k.value'.
          'FROM keywords k'.
          'INNER JOIN documents d '.
          'ON k.document_id = d.id'.
          'WHERE k.document_id IN ('.$ids.')';
        $results = self::$dbLink->query($query);

        if( $results === false ) {
          throw new Exception('Ocurrió un error al consultar a la DB.', 500);
        }
        $results = $results->fetchAll(PDO::FETCH_ASSOC);
        $filenames = $this->buildFileNames( $results, $ids, $format );
      }
      else {
        throw new Exception('No hay una conexión establecida con la DB.', 500);
      }
      return $filenames;
    }
    catch(Exception $e) {
      $this->error = 'Error al intentar conectar con la BD: ' . $e->getMessage();
    }
  } //<----- Missing return statement

推荐答案

如果抛出并捕获异常，函数会返回什么?

If an exception is thrown and caught, what will the function return?

您应该在 catch 块中或 try-catch 块之后有一个 return 语句.仅在 try 块中包含 return 语句是不够的.

You should have a return statement in the catch block, or after the try-catch block. Having a return statement in the try-block only is not enough.

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