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Date: Sat, 28 Jul 2012 08:37:13 +0100
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Subject: Re: [PHP-DEV] Re: Generators in PHP
From: lester@lsces.co.uk (Lester Caine)

Rasmus Lerdorf wrote:
>>> I don't think this generator question is any different. We need to
>>> >>explain generators in the simplest way possible. The simplest way to
>>> >>explain generators is to not even worry about them being generators at
>>> >>all. Simply say that functions can now return arrays one element at a
>>> >>time using the new yield keyword. That's all.
>> >
>> >It's this 'concept' that I am having trouble seeing in the general
>> >process that is required using PHP to generate web pages. At the end of
>> >the day I have to generate the finished page or sub-page so I need all
>> >the results anyway.
> Sure, but that doesn't mean it has to all be in memory at the same time.
> You can read lines from a large file line-by-line, process that line and
> output the result before you move onto the next line.

Exactly ... when uploading the NLPG csv files I process them line at a time and 
store to the database. I always have ... which is why I don't recognise the 
initial 'complaint' that justified adding this. These files can be 100Mb+ so 
there is no way one would process them by reading the whole lot in as the 
'example' gave. You just call the function that processes the particular type of 
line which is based on the first two characters ... after reading the line.

-- 
Lester Caine - G8HFL
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