Description:
------------
Sometimes eval() is used as a way to execute PHP code within a shell (legal remote access for debugging purposes) or to execute code compiled to PHP from higher-level scripting language or the code stored in the database etc.

The common problem is that a call of non-existing function (or object instantiation) results in termination of the whole script, not just eval'd code.

I think that it's not correct in such cases.

The obvious way to implement it would be adding flags to eval() function (as a second argument) one of which could indicate that eval() should not terminate the script but just return an error or raise an exception.

Such flags could be:
EVAL_FATAL_DIE        // current behavior
EVAL_FATAL_ERROR      // return FALSE
EVAL_FATAL_EXCEPTION  // raise an exception of a predefined class (e.g. EvalException)

Test script:
---------------
try {
  eval('non_existing_function()', EVAL_FATAL_EXCEPTION);
}
catch (EvalException $e) {
  Logger::log('Error in eval\'d code', $e);
}

Expected result:
----------------
Exception being logged and script continued its execution.

Actual result:
--------------
Fatal error:  Call to undefined function non_existing_function() in ... : eval()'d code(1) on line 1