PHP - Generate Random Floating Point

How to generate a unique random number in php??? Any one who can help  me?

I am looking to generate a random number for every user contribution as a title of the contribution.

I could simply check the database each time with a query and generate a number which does not equal to any of the entries of the database. But I imagine this as inefficient and it could become slow if the database is big in my opinion. Also I'd have to contain all the numbers of the database somewhere to manage the "not equals to", in an array or something similar but that can end up as a giant one.

Excuse the layman's speech I am new to this.

Any suggestions how this can be solved efficiently without straining the resources too much? You can explain it linguistically and do not have to provide me any scripts, I will figure it out.

Hello........

Currently i am struggling with php script....... can any one tell me or guide me how to code Automatically generating random number with in the range of 19 to 90 and the number has to change with in 24 hours time duration.........
It's urgent........

Thanks in advance.....
Rooban.S

hi!, is it possible to use rand() to generate unique number that will be saved in a database as a primary key? Since i dont want to have numbers like 00001 incrementing on the table. They dont look like real account numbers... i need something like 45642  or 95452 and the like.

thanks in advance.

This might be a bit hard to explain!

I have a grid, 32x32 which is actually 1024 mySQL rows in a table, you can see the table he http://interbitlotto.com/grid
each cell is a row in the database, top left is ID 1, bottom right is id 1024.

get it?

right well its a battle ship game, and im stuck on the automatic battle ship placement script. I have displayed the generated boats as misses so we can see them.

The problem i am having, is that the random number generater chooses a cell too close to the side so the boat ends up wrapping to the other side. I cant think of a way to detect if its going to wrap, if it is then choose another cell...

The code below chooses the orientation of the boat, then chooses a random cell... but as you can see, no code for "across" to stop it choosing one too close to the side.

Any ideas?

Code: [Select]
                             $orientation = rand(1,2); //get random orientation  - 1 = down, 2 = across.

                             if ($orientation == 1){
                                $multiply = 32;  //cells till next row
                                $max = 1024 - (32 * $boatlength); //prevents it from choosing a cell too close to the bottom
                                $startcell = rand(1,$max);
                             }else{

                                $multiply = 1;  //across, so next cell
                                $max = 1024;
                                $startcell = rand(1,$max);
                             }

Hi,

What I'm trying to do is create a script that generates a random list of cars whenever it is run. I have a list of available cars in a MySQL database. I'm just not sure how to get php to generate a list of, say, 20 cars, that are randomly picked from the cars in the database. I may also want to add other statistics like MPG (also already in the database). Can anyone show me how to do this? And is it possible to format the returned data in a table or div format?

Thanks in advance
Unk

Basically I am setting up my own cricket management game, but there are 3 areas that I am slightly stuck on and would appreciate help:

1) When a use registers, I need to create 11 players for their team. For this, I am going to have one text files with first names and one text file with surnames. How can I open each file and select a name and then match them together?

2) I need to create the list of games to be executed at particular times through a cron job. How can I go through all the teams in a table and match them together in games, ensuring everyone plays everyone? If a new player registers, he will be put into a random league and so the games for that league will have to be redone

3) How can I set up a cron job to execute the above games? Each team should play once a day and so if there are 24 teams in a table, there will be 12 games that occur through this cron job. I assume cron jobs are the best thing for this.

Any help would be appreciated.
Thanks.

Hello,

Do you guys have any idea how to start an Automatic Order Number System in PHP?

I have an service Website, where you can purchase something, and i want after the redirect to "Success.php" to generate an order number, to be shown to the buyer and saved in Date Base for me.

Any solutions helps.

I´m beginner so don´t mind

 

As above,

I have a lottery style site that picks a random number between 1-8 but my users complain for some reason that this is not enough.

So i was told to look into using fopen and random.org to generate a random number.

Anyone have experience of this and perhaps a code snippet for me to look at and possibly use?

help will be appreciated.

Hope this topic is ok here as i would be using php to do the encryption..


So i have just worked out how md5 hashes work- i thought md5 made passwords ultra secure -  and for a password up to say 6 characters long, including numeric characters, then it is very easy to crack by doing a brute force, so i ask what is the point, i am wanting to encrpt passwords in a db and i can't see why my own 'home brew' method should be any more crackable than an md5 hash.

What encrption would you recommend, so there would need to be a php class avaialble.

This topic has been moved to Other Libraries and Frameworks.

http://www.phpfreaks.com/forums/index.php?topic=350748.0

At which point do I use DATE_FORMAT()?

On insert, on select, or ideally can I use it when I echo it out? I haven't used this function before, so I'm not too familliar with it. Can I do something like this?..

echo DATE_FORMAT($item['created_at'], '%d/%m/%Y');

im working on a point system for my forum where points are awarded based on actions taken.


$scores = array(
                'login' => 1,
                'editor' => 10
                );


so if a user logs in then they will be awarded 1 point, if they edit their post then they get 10 points etc.

So in my login process page i process the login then award the points that it is worth with $score['login'].
Everything works fine.

My problem is that this is a forum package like phpbb and mybb where people download the package and can install their own forum. So i want them to be able to add to the points list. For example the admin chooses to award 10 points for every post that is made.
how would i go about implementing this? the points categories would be in the database but what happens in the post processing page when i add the post to the database? how would i know that the admin wants some points awarded? the database would look like so:

id    title    points
1     post    10

but the title can change based on the admins choosing of words.

I hope i explained this ok.

I'm just starting to research xml and I need to know if there's a specific name I should be looking for.

I'm trying to read data from an xml file which is easy when all the tags are different but I've got a test file of students where alot of the data is the same.

For instance:

<STUDENTS>
    <STUDENT>
        <FIRSTNAME>Micheal</FIRSTNAME>
        <LASTNAME>Dorne</LASTNAME>
         <GRADE>10</GRADE>
         <MATHSCORE>89</MATHSCORE>
         <TEACHER>Flinn</TEACHER>
    </STUDENT>
    <STUDENT>
        <FIRSTNAME>Terry</FIRSTNAME>
        <LASTNAME>Williams</LASTNAME>
         <GRADE>11</GRADE>
         <MATHSCORE>78</MATHSCORE>
         <TEACHER>Edwards</TEACHER>
    </STUDENT>
    <STUDENT>
        <FIRSTNAME>Kimberly</FIRSTNAME>
        <LASTNAME>Jenson</LASTNAME>
         <GRADE>10</GRADE>
         <MATHSCORE>92</MATHSCORE>
         <TEACHER>Flinn</TEACHER>
    </STUDENT>
</STUDENTS>

I've reached a point where I need to acquire data from an xml file structured similar to this and need to know where to start. I could be looking for all the data on one specific student or acquiring a list of all student names that have the same teacher for example.

I'd appreciate it if someone could point me the right direction with this. Thanks.

H guys,
I have created a quiz, however what i would like to do is have something that keeps an eye on the quiz.  For example if someone is taking the quiz however get 4 incorrect answers in a row then it will abort the quiz.

is it something like a for loop for example.... im not sure?

The code i already got is a basic quiz however im just looking on expaning it more.

Thanks for any help, i appreciate it!

Code: [Select]
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<? if($attempted == true && !isset($q1)) { echo 'bgcolor="#FFFFCC"'; } ?>
<input type="radio" name="q1" id="q1a" value="1" />An IDS evaluates a suspected intrusion once it has taken place and signals an alarm<BR><? if($q1 == "1"){echo "checked=\"checked\"";} ?>
<input type="radio" name="q1" id="q1b" value="2">An IDS blocks intrusions before it happens and signal an alarm<BR><? if($q1 == "1"){echo "checked=\"checked\"";} ?>
<input type="radio" name="q1" id="q1c" value="3">An IDS blocks all intrusions before it happens and monitors the network, however does not signal an alarm.<BR><? if($q1 == "1"){echo "checked=\"checked\"";} ?></UL><hr />
<b>2. What does a Firewall do?<BR /><BR></b>
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<? if($attempted == true && !isset($q2)) { echo 'bgcolor="#FFFFCC"'; } ?>
<input type="radio" name="q2" id="q2a" value="1">Firewalls limit access once the intrusion is within a network and then signals an alarm.<BR><? if($q2 == "1"){echo "checked=\"checked\"";} ?>
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<? if($attempted == true && !isset($q3)) { echo 'bgcolor="#FFFFCC"'; } ?>
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<input type="radio" name="q3" id="q3b" value="2">Tripwire does not perform system integrity checks in terms of file change, however does prevent access to a network unless otherwise stated.<BR><? if($q3 == "1"){echo "checked=\"checked\"";} ?>
<input type="radio" name="q3" id="q3c" value="3">Tripwire helps identify changes in files. Tripwire records a set of information about all the important files in your server in case of a change.</p><? if($q3 == "1"){echo "checked=\"checked\"";} ?>
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</UL><hr />
<p><b>5. What does an Anti-root kit protect you from?</b> </p>
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  <? if($attempted == true && !isset($q5)) { echo 'bgcolor="#FFFFCC"'; } ?>
  <input type="radio" name="q5" id="q5a" value="1">Anti-rootkit protects from only viruses, key loggers and backdoors.<BR><? if($q5 == "1"){echo "checked=\"checked\"";} ?>
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  <input type="radio" name="q5" id="q5c" value="3">Anti-rootkit protects from only viruses and backdoors.<BR><? if($q5 == "1"){echo "checked=\"checked\"";} ?>
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