Online PHP editor | output for DI9em

@ 2014-11-03T06:30:25Z

<?php
set_error_handler(array('My_ToStringFixer', 'errorHandler'));
error_reporting(E_ALL | E_STRICT);

class My_ToStringFixer
{
    protected static $_toStringException;

    public static function errorHandler($errorNumber, $errorMessage, $errorFile, $errorLine)
    {
        if (isset(self::$_toStringException))
        {
            $exception = self::$_toStringException;
            // Always unset '_toStringException', we don't want a straggler to be found later if something came between the setting and the error
            self::$_toStringException = null;
            if (preg_match('~^Method .*::__toString\(\) must return a string value$~', $errorMessage))
                throw $exception;
        }
        return false;
    }
    
    public static function throwToStringException($exception)
    {
        // Should not occur with prescribed usage, but in case of recursion: clean out exception, return a valid string, and weep
        if (isset(self::$_toStringException))
        {
            self::$_toStringException = null;
            return '';
        }

        self::$_toStringException = $exception;

        return null;
    }
}

class My_Class
{
    public function doComplexStuff()
    {
        throw new Exception('Oh noes!');
    }

    public function __toString()
    {
        try
        {
            // do your complex thing which might trigger an exception
            return $this->doComplexStuff();
        }
        catch (Exception $e)
        {
            // The 'return' is required to trigger the trick
            return My_ToStringFixer::throwToStringException($e);
        }
    }
}

$x = new My_Class();

try
{
    echo $x;
}
catch (Exception $e)
{
    echo 'Caught Exception! : '. $e;
}

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught TypeError: My_Class::__toString(): Return value must be of type string, null returned in /in/DI9em:54 Stack trace: #0 /in/DI9em(63): My_Class->__toString() #1 {main} thrown in /in/DI9em on line 54
Process exited with code 255.
Output for 7.4.0 - 7.4.33: Fatal error: Uncaught Error: Method My_Class::__toString() must return a string value in /in/DI9em:63 Stack trace: #0 {main} thrown in /in/DI9em on line 63
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Caught Exception! : Exception: Oh noes! in /in/DI9em:41 Stack trace: #0 /in/DI9em(49): My_Class->doComplexStuff() #1 /in/DI9em(63): My_Class->__toString() #2 {main}
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: Caught Exception! : exception 'Exception' with message 'Oh noes!' in /in/DI9em:41 Stack trace: #0 /in/DI9em(49): My_Class->doComplexStuff() #1 /in/DI9em(63): My_Class->__toString() #2 {main}
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Method My_Class::__toString() must return a string value in /in/DI9em on line 63
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/DI9em on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/DI9em on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/DI9em on line 7
Process exited with code 255.

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