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php-general Digest 6 Oct 2008 07:00:18 -0000 Issue 5720

php-general-digest-helplists.php.net
Date: Mon Oct 06 2008 - 02:00:18 CDT

php-general Digest 6 Oct 2008 07:00:18 -0000 Issue 5720

Topics (messages 281451 through 281462):

Re: First 30 characters of a strong
        281451 by: Ashley Sheridan

mt_rand() - the same forever?
        281452 by: Janek
        281453 by: Richard Heyes
        281454 by: Janek
        281455 by: Ashley Sheridan
        281456 by: Janek
        281457 by: Jochem Maas

Politics
        281458 by: Amy

Re:
        281459 by: huaizong wang

Join The Team
        281460 by: Hemant Patel

Best Search Algorithm for Millions of record
        281461 by: Hemant Patel
        281462 by: Micah Gersten

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----------------------------------------------------------------------

attached mail follows:

On Sun, 2008-10-05 at 14:52 -0400, Ron Piggott wrote:
> How do I display the first 5 characters of a string?
>
> $string="abcdefghijklmnopqrstuvwxyz";
>
> my desired output is
>
> abcde
>
>

substr($string, 0, 5);

Ash
www.ashleysheridan.co.uk

attached mail follows:

I wonder whether I can rely on the stability of mt_srand() and
mt_rand(). I want them to generate the same sequence for a fixed seed,
regardless of PHP version. Do you think I can trust it?
Janek

attached mail follows:

> I wonder whether I can rely on the stability of mt_srand() and
> mt_rand(). I want them to generate the same sequence for a fixed seed,
> regardless of PHP version. Do you think I can trust it?
> Janek

Keep in mind (if you're not already) that mt_rand() doesn't
technically need to be seeded.

--
Richard Heyes

HTML5 Graphing for FF, Chrome, Opera and Safari:
http://www.phpguru.org/RGraph

attached mail follows:

I know, but I *want* to seed it. My goal is to have a fixed
pseudorandom sequence for each integer (seed) and I don't want those
sequences to change regarding PHP version.

Janek

On Sun, Oct 5, 2008 at 9:52 PM, Richard Heyes <richardphp.net> wrote:
>> I wonder whether I can rely on the stability of mt_srand() and
>> mt_rand(). I want them to generate the same sequence for a fixed seed,
>> regardless of PHP version. Do you think I can trust it?
>> Janek
>
> Keep in mind (if you're not already) that mt_rand() doesn't
> technically need to be seeded.
>
> --
> Richard Heyes
>
> HTML5 Graphing for FF, Chrome, Opera and Safari:
> http://www.phpguru.org/RGraph
>

attached mail follows:

On Sun, 2008-10-05 at 21:57 +0200, Janek wrote:
> I know, but I *want* to seed it. My goal is to have a fixed
> pseudorandom sequence for each integer (seed) and I don't want those
> sequences to change regarding PHP version.
>
> Janek
>
> On Sun, Oct 5, 2008 at 9:52 PM, Richard Heyes <richardphp.net> wrote:
> >> I wonder whether I can rely on the stability of mt_srand() and
> >> mt_rand(). I want them to generate the same sequence for a fixed seed,
> >> regardless of PHP version. Do you think I can trust it?
> >> Janek
> >
> > Keep in mind (if you're not already) that mt_rand() doesn't
> > technically need to be seeded.
> >
> > --
> > Richard Heyes
> >
> > HTML5 Graphing for FF, Chrome, Opera and Safari:
> > http://www.phpguru.org/RGraph
> >
>
Doesn't it also rely on the system clock as well?

Ash
www.ashleysheridan.co.uk

attached mail follows:

On Sun, Oct 5, 2008 at 10:05 PM, Ashley Sheridan
<ashashleysheridan.co.uk> wrote:
> On Sun, 2008-10-05 at 21:57 +0200, Janek wrote:
>> I know, but I *want* to seed it. My goal is to have a fixed
>> pseudorandom sequence for each integer (seed) and I don't want those
>> sequences to change regarding PHP version.
>>
>> Janek
>>
>> On Sun, Oct 5, 2008 at 9:52 PM, Richard Heyes <richardphp.net> wrote:
>> >> I wonder whether I can rely on the stability of mt_srand() and
>> >> mt_rand(). I want them to generate the same sequence for a fixed seed,
>> >> regardless of PHP version. Do you think I can trust it?
>> >> Janek
>> >
>> > Keep in mind (if you're not already) that mt_rand() doesn't
>> > technically need to be seeded.
>> >
>> > --
>> > Richard Heyes
>> >
>> > HTML5 Graphing for FF, Chrome, Opera and Safari:
>> > http://www.phpguru.org/RGraph
>> >
>>
> Doesn't it also rely on the system clock as well?
>
>
> Ash
> www.ashleysheridan.co.uk
>
>

No. When I give a fixed seed to mt_srand(), each time I get the same
sequence of mt_rand()s. My question is wheather the actual algorithm
behind these functions is likely to change in the next version of PHP
or not.

Janek

attached mail follows:

Janek schreef:
> On Sun, Oct 5, 2008 at 10:05 PM, Ashley Sheridan
> <ashashleysheridan.co.uk> wrote:
>> On Sun, 2008-10-05 at 21:57 +0200, Janek wrote:
>>> I know, but I *want* to seed it. My goal is to have a fixed
>>> pseudorandom sequence for each integer (seed) and I don't want those
>>> sequences to change regarding PHP version.
>>>
>>> Janek
>>>
>>> On Sun, Oct 5, 2008 at 9:52 PM, Richard Heyes <richardphp.net> wrote:
>>>>> I wonder whether I can rely on the stability of mt_srand() and
>>>>> mt_rand(). I want them to generate the same sequence for a fixed seed,
>>>>> regardless of PHP version. Do you think I can trust it?
>>>>> Janek
>>>> Keep in mind (if you're not already) that mt_rand() doesn't
>>>> technically need to be seeded.
>>>>
>>>> --
>>>> Richard Heyes
>>>>
>>>> HTML5 Graphing for FF, Chrome, Opera and Safari:
>>>> http://www.phpguru.org/RGraph
>>>>
>> Doesn't it also rely on the system clock as well?
>>
>>
>> Ash
>> www.ashleysheridan.co.uk
>>
>>
>
> No. When I give a fixed seed to mt_srand(), each time I get the same
> sequence of mt_rand()s. My question is wheather the actual algorithm
> behind these functions is likely to change in the next version of PHP
> or not.

not likely to change in the next version at all. but there is no guarantee that
somewhere down the road a new 'rand' algorythm won't be used either,
3 things to consider doing:

1. write your own php extension that copies the mt_srand() function as
it is now and use your extension's version of the function ... then you
can be sure it won't change.

2. ask the devs on internalslists.php.net what they think the likelyhood
is that the output may change in the future.

3. pre-generate the sequences and store them, then use those pre-generated
sequences instead of using mt_srand() (obviously this may not be viable at all)

>
> Janek
>

attached mail follows:

confronted gillion presently flakey expanded courses newsreader publicaccess storages

attached mail follows:

On Sun, Oct 5, 2008 at 1:00 PM, huaizong wang <huaizongfujian2gmail.com> wrote:
>
>

attached mail follows:

Hi...ALL...
With Regads,
Hemant Patel

attached mail follows:

My question is Whether I should go for Full Text Based search or Database
Search...?And is there algorithm in php which can help me in this case...?

attached mail follows:

The question is, what are you searching for in the records?

Thank you,
Micah Gersten
onShore Networks
Internal Developer
http://www.onshore.com

Hemant Patel wrote:
> My question is Whether I should go for Full Text Based search or Database
> Search...?And is there algorithm in php which can help me in this case...?
>
>