PHP exception is caught, but error message still appears

Question

I use some code from the PHP manual to make an exception test, but I get some weird message.

Here it is the code:

function inverse($x) {
    if (!$x) {
        throw new Exception('Division by zero.');
    }
    else return 1 / $x;
}

try {
    echo inverse(5) . "\n";
    echo inverse(0) . "\n";
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

// Continue execution
echo 'Hello World';

And here it is the output:

0.2
( ! ) Exception: Division by zero. in /var/www/OOPlearing/slash.php on line 10Call Stack#TimeMemoryFunctionLocation10.0002330188{main}(  )../slash.php:020.0002330232inverse( $x = 0 )../slash.php:17Dump $_SERVER$_SERVER['HTTP_HOST'] =string 'localhost' (length=9)$_SERVER['SERVER_NAME'] =string 'localhost' (length=9)Dump $_GETVariables in local scope (#2)$x =int 0
Caught exception: Division by zero.Hello World

It's strange that although the exception has been caught, the exception message is still on...

Some of my local settings in php.ini:

error_reporting = E_ALL & ~E_DEPRECATED
display_errors =On
display_startup_errors = Off
log_errors = Off
......
html_errors = On

My notebook:

ubuntu11.04
mysql  Ver 14.14 Distrib 5.1.54
PHP 5.3.5-1

Update(2012.1.16) It's the xdebug extension that resulted in such error outputs. The xdebug default shows stack traces on error conditions. For those who want to disable it can do below instruction:

xdebug_disable();//put it on the header of your code,like cofig file.

more details

Answer 1

When you try/catch() a block of code then you wont get a fatal error of "Uncaught exception". A fatal error will cause the script to stop executing at the point of the error. Since you caught the exception, it did what you told it to: Echo the string + error message, then it continued execution to "Hello World!". If anything your error reporting is more verbose due to your INI settings, like the stack trace printout.

Answer 2

If you do not want to disable xdebug and you do not want the trace message to appear, you can turn off the display of the exception trace with

xdebug.show_exception_trace = 0

in your php.ini