When is it best to use exceptions in PHP?

Question

I usually point out an error in the method when returning false, but it is not always gel with me semantically (since depending on the method it falsemay be a valid return).

I studied exceptions, and I wonder if they are one-time solutions? Should I return falsewhere I can still?

I may have completely missed the point here, so please bear with me.

// My old way
function getProductById($id) {

    if ( ! is_numeric($id)) {
         return false;     
    }

}

// My consideration
function getProductById($id) {

    if ( ! is_numeric($id)) {
         throw new Exception('The id must be numerical!');     
    }

}

Answer 1

The exceptions are great! Let you save the error handling code from the error code.

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try {    
    func1($a);  
    func2($b);  
    func3($c);  
} catch (Exception $e) {  
    // error handling here  
}  

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Answer 2

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Answer 3

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function getById($id, $throwException = true) {
    if (!self::idExists($id)) {
        if ($throwException) {
            throw new IdNotFoundException();
        } else {
            return NULL;
        }
    }
    return self::getByWhereClause('id = ' . self::escape($id), $throwException);
}

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Answer 4

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