Can I throw exception in a for loop , if memory exceeds in that loop

Question

How can I handle an exception happening in a foreach loop?

I want to throw my exception if the for loop didn't work properly.

As data is huge, foreach exits because PHP's memory limit is exceeded.

try
{
 foreach()
}catch (exception $e)

{
echo $e;
}

This is not working. How do I throw an exception?

Answer 1

Hi,

Memory exceeded is a fatal error, not an exception and cannot be handled with try/catch blocks. What you need is set_error_handler.

EDIT: If that does not work you can use register_shutdown_function as a last resort and check if the script was stopped by and error.

Regards, Alin

Answer 2

I don't think that is possible. memory exceed is a fatal unrecoverable error. so the page should be terminated when any of this happen.

But I found this question for catch E_ERROR : http://stackoverflow.com/questions/277224/how-do-i-catch-a-php-fatal-error

Answer 3

Depending on what happens inside your loop, you can use the memory_get_usage() function. This will not fix any memory related issues, but at least you can prevent PHP from exiting due to exceeding the memory_limit. Example:

try{
   $memory_limit = 1*1024*1024; /* 1M, this should be lower than memory_limit */
   foreach($something as $anything){
      if(memory_get_usage() >= $memory_limit){
          throw new Exception('Memory limit exceeded!');
      }
   }
}
catch(Exception $ex){
   //handle error, optionally freeing memory by unset()-ing unused variables
}