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PHP - Php Rand And Percentage
Hi,
I basically want a function that takes a parameter which is a percentage chance of the functioning returning true.
A user can move from tier 1->10 and at tier 1 there's a 70% chance to move to tier 2, from tier 2 there's a slightly less chance to move up, and so on.
I tried with the following piece of code:
public function rollTheDice($winnerPercentage)
{
$number = rand(1, 100);
if ($number <= $winnerPercentage)
return true;
return false;
}
The above code makes logical sense to me:
1. Pick a random number between 1 and 100.
2. If that number is less than or equal to the percentage, then we passed (example, if the random number is less than or equal to 70.. there must be a 70% chance of this?)
This however does not seem to work, in fact it appears that when simulating a roll, 70% fails at the very first step (where there is a 70% chance of winning..)
To actually make it to tier 10, has yet to be accomplished, so by simulating this with unlimited attempts for 120 seconds straight doesn't seem to "win".
I tried (just for fun) and change the if-statement so:
if ($number >= $winnerPercentage)
This seems to be working quite well, as the simulator quickly reaches tier 10 this way.
Any suggestions to code changes, or can someone explain why it is working way better when exchanging less than with greater than?
Similar TutorialsHello everybody, I just have a quick question. I am trying to develop a webpage for dice rolling (to use for myself when i play dnd) Now, I know a lot of the random functions is computer languages are not truly random, and thus have some areas that the value will be the result more than others. What would be a good way to try to make it as "random" as possible, or am I just over-thinking it? Hi there, I have one question about the function rand(), What if i want to have an number between 0 and 360 Without 90 to 180 so 91,92,93,94.....180 can't be the number how can i do that? btw, I know its possible through if,while,for and so on. But is there an other way to do this? Hey, This is my [faulty] PHP $input3 = array("BB, BB, BB, BB, BB, BB, BB, BB, BB, bb"); $rand_keys3 = array_rand($input3, 2); $BB1 = $input3[$rand_keys3[0]] . "\n"; $BB2 = $input3[$rand_keys3[1]] . "\n"; $input4 = array("HD, HD, HD, HD, HD, hd"); $rand_keys4 = array_rand($input4, 2); $HD1 = $input4[$rand_keys4[0]] . "\n"; $HD2 = $input4[$rand_keys4[1]] . "\n"; $input5 = array("DD, DD, DD, DD, DD, DD, DD, dd"); $rand_keys5 = array_rand($input5, 2); $D1 = $input5[$rand_keys5[0]] . "\n"; $D2 = $input5[$rand_keys5[1]] . "\n"; $input6 = array("CC, CC, CC, CC, CC, cc"); $rand_keys6 = array_rand($input6, 2); $C1 = $input6[$rand_keys6[0]] . "\n"; $C2 = $input6[$rand_keys6[1]] . "\n"; $input7 = array("HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, HG, hg"); $rand_keys7 = array_rand($input7, 2); $HG1 = $input7[$rand_keys7[0]] . "\n"; $HG2 = $input7[$rand_keys7[1]] . "\n"; And this is the error I'm getting: Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in /home/content/91/6351791/html/dogtrader.php on line 48 Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in /home/content/91/6351791/html/dogtrader.php on line 54 Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in /home/content/91/6351791/html/dogtrader.php on line 60 Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in /home/content/91/6351791/html/dogtrader.php on line 66 Warning: array_rand() [function.array-rand]: Second argument has to be between 1 and the number of elements in the array in /home/content/91/6351791/html/dogtrader.php on line 72 I've checked back over it all and looked up the function in various places to check what they say about it, but can't see which bit I'm going wrong wit! :[ If anybody has any advice as to what to do to fix it, it would be much appreciated. Cheers. I have this in my code: $dr =rand(0, 100); echo $dr; Here are the last 5 refreshes: 997 6336 6144 1110 2914 similar results when I use mt_rand()... Really need a hand from someone mysql query is pretty basic. I have been ask to add a random order to this query. $query = "SELECT rd.user_id FROM {$regions_data_table} rd WHERE rd.field_id = {$regions_field_id} AND rd.value LIKE %s AND rd.user_id NOT IN (SELECT um.user_id FROM {$wpdb->base_prefix}usermeta um WHERE ((um.meta_key='wp_ul_disabled' AND um.meta_value=1) OR (um.meta_key='wp_ul_inactive' AND um.meta_value=1)) GROUP BY um.user_id)"; I have tried so many options but cannot seem to get it to work i am trying to insert order by rand(). Any help please? what am i doing wrong? I can't see it... I want to catch the rand variable but it doesn't. So I print an extra print at the bottom. So there should be two rand prints. Here's the code.
<html>
<head><title></title>
</head>
<body>
<form action='random.php' method='post'>
<?php
if(isset($_REQUEST['rand'])){
$rand = $_REQUEST['rand'];
print $rand . "<br /><br />";
} else {
print "rand: empty<br /><br />";
}
$rand = rand(1,1000);
print $rand."<br /><br />";
print "<input type='hidden' value='$rand' />";
?>
<input type='submit' value='scramble' />
</form>
</body>
</html>
I forgot to tell ya that the if statement returns rand: empty. Help...
Hi,
I'm having a bit of trouble. I want to order the same 9 results by RAND(). Currently I have them ordered by 'avg' (average views) and that's working fine, but when I add a sub query to make those 9 results scatter by random it's causing some trouble.
Code I currently have that works:
$sql = "SELECT *, views / HOUR(TIMEDIFF(NOW(), date)) as avg FROM content WHERE date BETWEEN CURDATE() - INTERVAL 30 DAY AND NOW() - INTERVAL 2 HOUR AND views > 600 AND live = '0' ORDER BY avg DESC LIMIT 9"; Hey guys, I don't know what to do. I've got a script used for gamble: $gamble_rand = rand($number_of_tickets,$gamble_chance); if($gamble_chance == $gamble_rand){ If $number_of_tickets is set by 99 and $gamble_chance is set by 100 the chance is 1:100 that the If-Clause is not true. But it seems to me that PHP is making its on "random". Independent of the values PHP is interpreting that 20 times of 100 times the correct logic is false... If $number_of_tickets is set by 1 there's no big different. Its just a little bit less, but not the chance that it has to be. Thanks for helping and Merry Christmas :-) I have 2 sites here that does what i need them to do but i dont know how to put the 2 codes together i got it to upload all files and used rand() to give the files a # but it ends up giving them all the same # lol so they overwrite them selfs lol This site shows how to upload mltiple fiels with php. http://www.ehow.com/how_6345068_upload-multiple-files-php.html This site shows how to rename only 1 file uploaded with rand() http://php.about.com/od/advancedphp/ss/rename_upload.htm i pray this is not to hard to do and if any one gets bored after words can you show how to block a file type from being uploaded ? like php/exe types PS)i would call my self a php newbe lol and ty you for your time and help Code from http://php.about.com/od/advancedphp/ss/rename_upload.htm Code: [Select] <form enctype="multipart/form-data" action="upload.php" method="POST"> Please choose a file: <input name="uploaded" type="file" /><br /> <input type="submit" value="Upload" /> </form> //This function separates the extension from the rest of the file name and returns it function findexts ($filename) { $filename = strtolower($filename) ; $exts = split("[/\\.]", $filename) ; $n = count($exts)-1; $exts = $exts[$n]; return $exts; } //This applies the function to our file $ext = findexts ($_FILES['uploaded']['name']) ; //This line assigns a random number to a variable. You could also use a timestamp here if you prefer. $ran = rand () ; //This takes the random number (or timestamp) you generated and adds a . on the end, so it is ready of the file extension to be appended. $ran2 = $ran."."; //This assigns the subdirectory you want to save into... make sure it exists! $target = "images/"; //This combines the directory, the random file name, and the extension $target = $target . $ran2.$ext; if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target)) { echo "The file has been uploaded as ".$ran2.$ext; } else { echo "Sorry, there was a problem uploading your file."; } The code from http://www.ehow.com/how_6345068_upload-multiple-files-php.html Code: [Select] <form action="upload.php" method="post" enctype="multipart/form-data"> File: <input type="file" name="file[]"/><br/> File: <input type="file" name="file[]"/><br/> File: <input type="file" name="file[]"/><br/> <input type="submit" name="submit" value="Upload"/> </form> $destpath = "upload/" ; while(list($key,$value) = each($_FILES["file"]["name"])) { if(!empty($value)){ f ($_FILES["file"]["error"][$key] > 0) { echo "Error: " . $_FILES["file"]["error"][$key] . "<br/>" ; } else { $source = $_FILES["file"]["tmp_name"][$key] ; $filename = $_FILES["file"]["name"][$key] ; move_uploaded_file($source, $destpath . $filename) ; echo "Uploaded: " . $destpath . $filename . "<br/>" ; } } } This topic has been moved to MySQL Help. http://www.phpfreaks.com/forums/index.php?topic=326563.0 I want to use the following code to upload images to my server (below code works great) Code: [Select] <?php $rand = rand(1,99999999999999); $member_id = $_SESSION['SESS_MEMBER_ID']; if(isset($_FILES['uploaded']['name'])) { $target = "gallery/"; $allowed_filetypes = array('.jpg','.gif','.bmp','.png'); $max_filesize = 524288; // Maximum filesize in BYTES (currently 0.5MB) $fileName = basename($_FILES['uploaded']['name']); $target = $target . $fileName; $errors = array(); // Get the extension from the filename. $ext = substr($filename, strpos($filename,'.'), strlen($filename)-1); // Check if the filetype is allowed. if(in_array($ext,$allowed_filetypes)) { $errors[] = "The file you attempted to upload is not allowed."; } // Now check the filesize. if(filesize($_FILES['uploaded']['tmp_name']) > $max_filesize) { $errors[] = "The file you attempted to upload is too large."; } // Check if we can upload to the specified path. if(is_writable($target)) { $errors[] = "You cannot upload to the specified directory, please CHMOD it to 777."; } //Here we check that no validation errors have occured. if(count($errors)==0) { //Try to upload it. if(!move_uploaded_file($_FILES['uploaded']['tmp_name'], $target)) { $errors[] = "Sorry, there was a problem uploading your file."; } } //If no errors show confirmation message if(count($errors)==0) { echo "<div class='notification success png_bg'> <a href='#' class='close'><img src='img/cross_grey_small.png' title='Close this notification' alt='close' /></a> <div> The file {$fileName} has been uploaded<br>\n </div> </div>"; //echo "The file {$fileName} has been uploaded"; echo "<br>\n"; echo "<a href='gallery.php'>Go Back</a>\n"; } else { //show error message echo "<div class='notification attention png_bg'> <a href='#' class='close'><img src='img/cross_grey_small.png' title='Close this notification' alt='close' /></a> <div> Sorry your file was not uploaded due to the following errors:<br>\n </div> </div>"; //echo "Sorry your file was not uploaded due to the following errors:<br>\n"; echo "<ul>\n"; foreach($errors as $error) { echo "<li>{$error}</li>\n"; } echo "</ul>\n"; echo "<br>\n"; echo "<a href='gallery.php'>Go Back</a>\n"; } } else { //Show the form echo "Use the following form below to add a new image to your gallery;<br />\n"; echo "<form enctype='multipart/form-data' action='' method='POST'>\n"; echo "Please choose a file: <input name='uploaded' type='file' /><br />\n"; echo "<input type='submit' value='Upload' />\n"; echo "</form>\n"; //Echo Tests! echo "<br /><br />Random FileName: "; echo $rand; echo "<br />"; echo "member ID: #"; echo $member_id; } ?> i then want it to rename the files for example: "test.png" is uploaded and name changed to "92997863_321.png" (where first number is using my $rand then the "_" then second number is my $member_id) the script already got these pieces of information and also gets the file extension using the $ext code. can this be done, and can i also upload the new filename to my sql table? Okay, so I'm kind of a PHP noob.
But out of context, for this site that I'm designing, it's easiest if I make a directory in the temporary folder PHP uses. In my case, /tmp/ because I am on Linux.
I want to use rand() to generate a random name for the page. But I then realized something, rand() could produce duplicates. How do I prevent PHP from trying to make the same directory at the same time? I know there are functions that will check if a file exists but I'm assuming it'll fail if that directory is currently being created, right?
How do I assure thread safety?
I willing to change my idea and not use rand(). Is there a way to get a unique key for each anonymous user on my site?
I have made a 'health bar' for a simple browser game i have been working on.
I want to use a background image to fill the health bar, so if for example, the player had full health, the health bar image width would be 100%
is it possible to say set, the characters max health and the characters actual health and work it out as a percentage so i can stretch the image width as far as it needs to go?
sorry if i haven't been too clear, my understanding of maths is not so good.
Thanks for any tips.
hey guys is it possible to have an output that will echo a percentage between 2 tables? like students vs detentions would give like 45%.. I have a scratch ticket system I made, and this code generates if a user will win or not. Code: [Select] $card1 = rand(1,5); $card2 = rand(1,5); if($card1 == "1" && $card2 == "1"){ //I WON!!! do my queries here/etc }else{ //Failed } Okay, now how can I make it so I can set it up so I can change it to 5% of winning, 10% of winning, 15% of winning, 20% of winning/etc so on? instead of just a random count function? Hello In my query i have x activities, then i have the count of how many still to be executed, i need to get the percentage of the total executed I mean i have 200 activities, 20 have been executed, so i want to have 10% done My query is this one but missing the percentage field
SELECT COUNT(*) AS total,
IFNULL(SUM(CASE WHEN (t1.dataPrevista >= CURDATE() OR ae.Fim <= CURDATE()) THEN 1 ELSE 0 END),0) AS exec
FROM atividades AS t1
INNER JOIN anosescolares AS ae ON (t1.`idAnoEscolar` = ae.idAnoEscolar)
WHERE ae.Estado = 1;
any help? Hmm, not quite sure how to do this one... If i have lots of strings saved in a mysql table and one was... "A man and a dog took a nice walk in the park" If a user then wanted to input another string into the table, but i wanted to check the new string was at least 5% different to all other in the table, how would i about doing this? Is it possible to do this via mysql, or would i have to pull out all the strings into a php array and process it that way... somehow? This topic has been moved quickly to PHP Regex because I need to go to work instead of lurking phpfreaks. http://www.phpfreaks.com/forums/index.php?topic=359460.0 hello guys, i need a help from u. from past 1 week , i am searching for it. may be it is simple query for you . in my project, i am uploading a file, for example 5mb of audio file, while uploading i need to display a progress bar along with percentage of how much it is uploaded to server ( as it works in google chrome browser). i tried several codes by searching in google . No code is working. i can able to display only loader.gif image not the status bar with percentage. so pls guys if you have these codes, pls share it . Hi all,
I am building a random prize assigner function based on weighted percentages.
I am able to assign a basic true/false weighting but am struggling to form a way of selecting an array based prize based on the win rate.
Heres my current code:
function selectPrize() {
$prizes = array(
0 => array(
'name' => 'Top Prize',
'rate' => 50
),
1 => array(
'name' => 'Middle Prize',
'rate' => 30
),
2 => array(
'name' => 'Bottom Prize',
'rate' => 20
),
);
// oops
}
selectPrize();
Could somebody please give me pointers on how i could approach this?
Thanks.
Edited by biggieuk, 19 June 2014 - 05:14 AM. |
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