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Re: use of array_key_exists() to prevent duplicates? [message #173014 is a reply to message #173013]

Thu, 17 March 2011 15:58

Captain Paralytic
Messages: 204
Registered: September 2010

Karma:

Senior Member

On Mar 17, 3:35 pm, William Gill <nos...@domain.invalid> wrote:
> I have a very simple app that I am working on. I have input files
> containing records with a unique serial number followed by a short (<255
> char) memo. The source program duplicates records from previous runs,
> along with any new records. I want to create a result file w/o
> duplicates. I am thinking of reading the files into an array where
> serial number becomes the key and memo the value, using
> array_key_exists() to filter out duplicates. The source files are no
> more than a couple hundred records each, and the master should never
> exceed a couple thousand.
>
> Does anybody see any drawbacks to this, or have a better approach?
>
> Thanks,
>
> Bill

Alternative 1) Just assign the values to an associative array with the
serial number as the key. At the end a foreach will produce a list of
unique values. No need for array_key_exists() at all.

Alternative 2) If you are planning on storing the data in a database
just use INSERT IGNORE.

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[Message index]

		use of array_key_exists() to prevent duplicates? By: William Gill on Thu, 17 March 2011 15:35
		Re: use of array_key_exists() to prevent duplicates? By: Captain Paralytic on Thu, 17 March 2011 15:58
		Re: use of array_key_exists() to prevent duplicates? By: William Gill on Thu, 17 March 2011 17:09
		Re: use of array_key_exists() to prevent duplicates? By: Captain Paralytic on Fri, 18 March 2011 10:05
		Re: use of array_key_exists() to prevent duplicates? By: William Gill on Fri, 18 March 2011 15:06
		Re: use of array_key_exists() to prevent duplicates? By: Captain Paralytic on Fri, 18 March 2011 16:15
		Re: use of array_key_exists() to prevent duplicates? By: William Gill on Fri, 18 March 2011 16:34
		Re: use of array_key_exists() to prevent duplicates? By: Captain Paralytic on Fri, 18 March 2011 16:46
		Re: use of array_key_exists() to prevent duplicates? By: William Gill on Fri, 18 March 2011 17:17

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