PHP: \Exception or Exception inside a namespace

by Guilherme Soares   Last Updated September 12, 2019 02:26 AM

I am trying to handle some errors in my api. However I tried some so many ways to execute what it's needed to it done?

In the code i used Exception, \Exception, another class extending to Exception, "use \Exception". None of these options works. What i need to do execute the block catch?

  //Piece of source in the begin of file
    namespace Business\Notifiers\Webhook;
    use \Exception;
    class MyException extends \Exception {}

    //Piece of source from my class
    try{

        $products = $payment->getProducts();
        if(count($products) == 0)
            return;
        $flight_id = $products[0]->flight_id;
        $this->message = 'Sir, we have a new request: ';
        $products = null; //Chagind it to null to force an error..
        foreach($products as $product){

            $this->appendAttachment(array(
                'color' => '#432789',
                'text' => 
                    "*Name:* $product->name $product->last_name \n" . 
                    "*Total Paid:*  R\$$product->price\n",
                'mrkdwn_in' => ['text', 'pretext']
            ));
        }
    } catch(Exception $e){
        $this->message = "A exception occurred ";
    } catch(\Exception $e){
        $this->message = "A exception occurred e";
    } catch(MyException $e){
        $this->message = "A exception occurred";
    } 
Tags : php exception


Answers 2


First of all, you need to understand the difference between an exception and an error:

  1. http://php.net/manual/en/language.exceptions.php
  2. http://php.net/manual/en/ref.errorfunc.php

Trying to foreach over a null value will not yield an exception, but trigger an error. You can use an error handler to wrap an error in an exception, as such:

<?php

function handle ($code, $message)
{
    throw new \Exception($message, $code);
}

set_error_handler('handle');

// now this will fail
try {
    $foo = null;
    foreach ($foo as $bar) {
    }
} catch(\Exception $e) {
    echo $e->getMessage();
}

However in your code, you can simply check if $products is null and if so, throw an exception:

if (!$products) {
    throw new \Exception('Could not find any products')
}
foreach($products as $product) { ...
motanelu
motanelu
October 15, 2016 21:32 PM

The accepted answer above give the real cause of the issue, but did not answer the topic

If in case someone is interested and is looking for

what is the difference between Exception and \Exception inside a namespace?

Still valid against PHP 7.3.5:

  1. \Exception: Refer to Exception in root namespace
  2. Exception: Refer to Exception in current namespace
  3. PHP does not fall back to root namespace, if the class cannot be found in current name space, it emits an error.

<?php
namespace Business;
try {
    throw new Exception("X"); //  Uncaught Error: Class 'Business\Exception' not found
} catch (Exception $e) {
    echo "Exception: " . $e->getMessage();
}

<?php
namespace Business;
class Exception extends \Exception {} // means \Business\Exception extends \Exception

$a = new Exception('hi'); // $a is an object of class \Business\Exception
$b = new \Exception('hi'); // $b is an object of class \Exception
Michael Mitch
Michael Mitch
September 12, 2019 02:25 AM

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