setting time limit inside a 'while' loop

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I'm trying to run an email validation script on a database of 500,000 emails. The problem is, when trying to connect to some of the domains, it takes too long to validate(I've seen it take more than 5 minutes) . I don't want to set a time limit for the entire script, but, I'd like to do something like each time it starts to check a new email address, set a time limit. Then, if that time limit is exceeded, write to the database that it timed out.

Any help would be greatly appreciated!

[colbec]

How about having two scripts, one main that contains the principal loop, inside the loop you include the subordinate script which returns a value on exit. The subordinate has its own 'set_time_limit(delay_in_seconds)?'

Just a thought, have not used it!

[Anon]

how set_time_limit works?

if you put set_time_limit(15) in the while loop, will it RESET time OUT to be 15 seconds later? if that is the case, just put set_time_limit(15) in your loop will work, right?