Throwing exceptions in a PHP Try Catch block

Question

I have a PHP function in a Drupal 6  module file   I am attempting to run initial variable validations prior to executing more intensive tasks  such as database queries   In C   I used to implement IF statements at the beginning of my Try block that threw new exceptions if a validation failed   The thrown exception would be caught in the Catch block   The following is my PHP code   function  modulename getData  field   table      try       if  empty  field           throw new Exception  The field is undefined                   rest of code here          catch  Exception  e        throw  e- gt getMessage            However  when I try to run the code  it s telling me that objects can only be thrown within the Catch block   Thanks in advance

User · Answer

throw  e- gt getMessage      You try to throw a string  As a sidenote  Exceptions are usually to define exceptional states of the application and not for error messages after validation  Its not an exception  when a user gives you invalid data

User · Answer

Just remove the throw from the catch block     change it to an echo or otherwise handle the error   It s not telling you that objects can only be thrown in the catch block  it s telling you that only objects can be thrown  and the location of the error is in the catch block     there is a difference   In the catch block you are trying to throw something you just caught     which in this context makes little sense anyway     and the thing you are trying to throw is a string   A real-world analogy of what you are doing is catching a ball  then trying to throw just the manufacturer s logo somewhere else  You can only throw a whole object  not a property of the object

User · Answer

To rethrow do    throw  e    not the message

User · Answer

function  modulename getData  field   table      try       if  empty  field           throw new Exception  The field is undefined                   rest of code here          catch  Exception  e                   Here you can either echo the exception message like           echo  e- gt getMessage              Or you can throw the Exception Object  e like          throw  e

User · Answer

Throw needs an object instantiated by  Exception  Just the  e catched can play the trick   throw  e

[php] Throwing exceptions in a PHP Try Catch block

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