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PHP - Rand() Filter??
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? 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,
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?
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? 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()... 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. 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...
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 :-) 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:
$sql = "SELECT *, views / HOUR(TIMEDIFF(NOW(), date)) as avg FROM content WHERE date BETWEEN CURDATE() - INTERVAL 30 DAY AND NOW() - INTERVAL 2 HOUR AND views > 600 AND live = '0' ORDER BY avg DESC LIMIT 9"; This topic has been moved to MySQL Help. http://www.phpfreaks.com/forums/index.php?topic=326563.0 I have 2 sites here that does what i need them to do but i dont know how to put the 2 codes together i got it to upload all files and used rand() to give the files a # but it ends up giving them all the same # lol so they overwrite them selfs lol This site shows how to upload mltiple fiels with php. http://www.ehow.com/how_6345068_upload-multiple-files-php.html This site shows how to rename only 1 file uploaded with rand() http://php.about.com/od/advancedphp/ss/rename_upload.htm i pray this is not to hard to do and if any one gets bored after words can you show how to block a file type from being uploaded ? like php/exe types PS)i would call my self a php newbe lol and ty you for your time and help Code from http://php.about.com/od/advancedphp/ss/rename_upload.htm Code: [Select] <form enctype="multipart/form-data" action="upload.php" method="POST"> Please choose a file: <input name="uploaded" type="file" /><br /> <input type="submit" value="Upload" /> </form> //This function separates the extension from the rest of the file name and returns it function findexts ($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/>" ; } } } 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?
Hey guys i am using a global filter on my $_POST function filter($str){return htmlentities($str, ENT_QUOTES);} $_POST = array_map('filter', $_POST); It helps me encode the stuff into the database. It works great on all my fields exept my arrays ... Ex: fields like this <input type="text" name="name[]" size="20"> breaks Any sugestions on gething this global filter working? Hi. I was hoping someone could tell me whether this is possible and if so how I could go about doing it preferably with a tutorial as im pretty new to programming. I have a database that will contain 100's of records. I want users to be able to select filter parameters on this data by both text and checkboxes with it automatically updating the results (hopefully without page reload). I managed this so far using this Jquery filter script: http://www.picnet.com.au/picnet-table-filter.html. As this will table will have so many rows however I think it would take ages to load so instead I would like to paginate the table but still allow filters applied to affect all records not just the ones displayed on the current page. Any ideas on how i could do this? Thanks in advance for your help. Hey, I have a word filter which is dectecting strings that are only embedded in words. Which i don't want it to do. For example: If i want to filter "FR" and some one puts france - it flags it because france contains FR. How do i make it only look for "FR" on its own seperated from a word instead of it flagging nearly all words with the two letters together? Heres my filter: $text = 'testing'; //this should not return 1 // fill this array with the bad words you want to filter and their replacements $bads = array ("test"); foreach($bads as $key => $search_needle) { if(stristr($text, $search_needle) == TRUE) { return(1); break; } } Hi,
I want to use an external rss in my site but the problem is that i only want to grab feeds that contain certain keywords in the title,
This is what i got so far to display the feed:
<?php
$html = "";
$url = "http://www.feedsite.com/conv-rss.asp";
$xml = simplexml_load_file($url);
for($i = 0; $i < 5; $i++){
$title = $xml->channel->item[$i]->title;
$link = $xml->channel->item[$i]->link;
$description = $xml->channel->item[$i]->description;
$pubDate = $xml->channel->item[$i]->pubDate;
$html .= "<a href='$link'><h3>$title</h3></a>";
$html .= "$description";
$html .= "<br />$pubDate<hr />";
}
echo $html;
?>
The feed is a classified jobs but i only need the jobs listed for musicians, keywords could be: bassist, singer, drummer, musician, etc..
Thanks
so I'm running a query on a database to get address's $address = $row['address']; it returns "1234 Test St" I want to be able to sort all the records by the street name without the numbers HI all, Yesterday i read quite alot about htmlentities() htmlspecialchars() mysql_real_escape_string But today i stumbled upon filter() (http://www.w3schools.com/php/php_filter.asp). Does anyone know if this is also a good way to sanitize and may even be an alternative for the other functions? OR is it something completly different? I am still a novice with this so please enlighten me : ) TY Hi All I have a script which imports values from a csv file created using excel. However there are several blank values within the file where the person creating it has used blank columns to create whitespace in the file. I have used array_filter to remove these from the array, however how do I remove the redundant keys and 'squash' everything together so it is nice and neat? eg import would be , ,id, , surname, ,firstname, ,DOB, , address, , which returns array after array_filter [1]-> id [3]->surname [5]->firstname [7]->DOB [9]->address I want to return as an array which would be Quote [0]-> id [1]->surname [2]->firstname [3]->DOB [4]->address Is there a function to do this or would I need to create a custom one? Hello, I have a client with a "contact us" form who has recently been receiving a lot of spam emails from the form. I already have a session set in place so the form is only active one time. I am now creating a filter for the message to look for things like a url or bb style codes etc. What I've got seems to be working but would like your thoughts on maybe a better way of doing it or if you see something I may be missing. IF an offending text is detected the ip address is sent to me and I can block ip from the site. If the message passes it is sent to the client. This is the related code. Code: [Select] <?php $themessage=str_replace("\r",'<br>',$_POST['message']); $badwords=array("[", "url", "http", "link", ".com", ".net", ".org", ".biz", "<"); $o=0; foreach($badwords as $key2 => $value2){ $pos = strpos($themessage, $value2); if ($pos==0) { } else{ $o=$o+1; } } if ($o==0) { //compose and send email to client } else{ $useraddress=$_SERVER['REMOTE_ADDR']; //compose and send email to me containing offending address } ?> |
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