PHP - Help With A Rand() Function

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?

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?

Hello all, I have some piece of code that is nested like this


$variable = 'This is a global argument';
function parentFunction($variable) {
function childFunction() {
echo 'Argument of the parent function is '.$GLOBALS['variable'];
}
childFunction();
}
parentFunction(5);


What I want to know is - Is there a way to access a variable from the parent function without passing arguments to the child function? (Something like how classes have parent::?). I don't want to use $GLOBALS because it might cause some variable collision, and I didn't want to pass arguments because incase I decide to change the arguments in the parent function I'd have to do it in the child function aswell. From my searching around in the Internet it seems like this is not possible, but if theres a slight chance that there might be something out there, i'm willing to give it a shot .

Thanks in advance

Question 1) Is the only and proper way to call a parent function "parent::function()"?  Are there other/better ways from within a child function?

Question 2) What are the deciding factors for when to make a function or attribute static?  How do you make that decision?  Assuming 5.3...

Thanks.

I need to call usort from a class function, and I'm puzzled about how to define the comparison function.

I've tried to define the comparison function in the same class, but I can't get usort to call it. I found one hint that it will work if I make the comparison function static, but I tried that, and it didn't work for me.

If I define the comparison function outside the class, it won't have access to object properties that it needs to operate.

The only solution I can think of is to define the comparison function outside the class and put the object properties it needs in globals. Is there a cleaner way to do this?

I have this function completely written in my class file that I am working on.  The point to this function is to be able to check the login of a user or administrator for either of the control panels associated with my site.

It will check the session intime as well as the page / module referenced.  Once it passes all those checks, it will check and ensure the emailaddress/password stored in the current session still holds true and the account is still active...  if the account is still active it will update the lastActivity as well as update all of the session variables with what is currently in the database.

What I am looking for is basically a look at the function, see if it looks good..  If there is any part to it that could create security holes for the site just off the login function itself...

Usage: $q->validUser($_SESSION['user'], $_mod);

<?php
 function validUser($sess, $p) {

if ($sess['inTime'] == '' && $p != 'login' && $p != 'logout') {
session_destroy();
$login = '0';
$_int = '';
return $login;
} else if ($sess['inTime'] < time()-3600 && $p != 'login') {
$sess['inTime'] = '';
session_destroy();
$this->check_login($sess, $p);
} else {
$this->user = $sess['emailAddress'];
$this->pass = $sess['password'];

$login = $this->sql_query("SELECT * FROM users WHERE emailAddress = '".$this->user."' AND password = '".$this->pass."' 
   AND status = '1' LIMIT '1'");
if ($login = $this->sql_numrows($login) < 1) {
$sess['inTime'] == '';
session_destroy();
$login = '0';
} else {
// logged in, lets update the database for last_activity AND the session.

$this->sql_query("UDATE users SET lastActivity = '".now()."' WHERE
  emailAddress = '".$this->user."'");
$login = $this->sql_query("SELECT * FROM users WHERE emailAddress = '".$this->user."' AND password = '".$this->pass."' 
       AND status = '1' LIMIT '1'");
$login = mysql_fetch_assoc($login);
foreach ($login as $key => $value)
{ 
$sess[$key] = $value;
}
$sess['inTime'] = time();
$login = '1';
}
return $login;
}
}

?>

That is the main function, sql_query and sql_numrows is:

<?php
function sql_query($query = "", $transaction = FALSE) {
unset($this->query_result);

if ($query != "") {
$this->num_queries++;
if ($transation == BEGIN_TRANSACTION && !$this->in_transation) {
$result = mysql_query("BEGIN", $this->db_connect_id);
if (!$result) {
return false;
}
$this->in_transaction = TRUE;
}

$this->query_result = mysql_query($query, $this->db_connect_id);
} else {
if ($transaction == END_TRANSACTION && $this->in_transaction ) {
$result = mysql_query("COMMIT", $this->db_connect_id);
}
}
if ($this->query_result) {
unset($this->row[$this->query_result]);
unset($this->rowset[$this->query_result]);

if ($transaction == END_TRANSACTION && $this->in_transaction ) {
$this->in_transaction = FALSE;
if (!mysql_query("COMMIT", $this->db_connect_id)) {
mysql_query("ROLLBACK", $this->db_connect_id);
return false;
}
}
return $this->query_result;
} else {
if ($this->in_transaction ) {
mysql_query("ROLLBACK", $this->db_connect_id);
$this->in_transaction = FALSE;
}
return false;
}
}

function sql_numrows($query_id = 0) {
if(!$query_id) {
$query_id = $this->query_result;
}
return ($query_id) ? mysql_num_rows($query_id) : false;
} ?>

Any insight that can help to benefit these functions would be appreciated.

When I put this chunk of code into it's own function:


function fetch_all ($dbc, $query) {

include ('knuffix_list_func.php');

pagination_start ($dbc, $query);

$offset = $pag_array[0];

$rows_per_page = $pag_array[1];

$query = $query . " LIMIT $offset, $rows_per_page";

echo "test query: " . $query;

knuffix_list ($query, $dbc);

pagination_end ($pag_array);
}


And when I echo out the query as you can see in the example, then I notice that the variables $offset and $rows_per_page never get appended.
I set the variable $pag_array to a global inside the function pagination_start(). It usually works when I DON'T wrap a function around this chunk of code, but if I do wrap a function around everything then the global suddenly won't work anymore.

Btw, this also won't work if I wrap a function around the function DECLARATIONS.

Any ideas, how I could make it work?

I want to define a function instead of repeating query in all my php pages. I call a function by passing an $id value and from that function i have to get all the info related to that id, like name, description and uom.    I am trying to do this, but i dont know how to get these values seperately.   here is my function  

function items($item_id)
{
$details = array(); 
$result = mysql_query("select item_id, name, uom, description from items where item_id=".$item_id."") or die (mysql_error());
while($row = mysql_fetch_array($result))
{
$details[] = array((stripslashes($row['name'])), (stripslashes($row['uom'])), (stripslashes($row['description'])));
}
return $details;
}

and i call my function like this

$info = items($id);

Can somebody guide me in this    

Hi I have a table class and functions I want to call in another function but can't get it working. Some help will be very welcome.

It seesm that the new table class is not working in this function if I pass the values to it, I have tested the class, it does get the post values I post to it so $_POST['id'] are being received as well as all the other $_POST's but the table class and find function is not working, it works fine if I don't put it in a function..

function edit() {
   
   if (isset($error)){ $error.="Please fix the error(s) above";}
   else {

      if ($_POST['id'] <> "") { 
                   
         $update =& new table($db, 'publisher');

         $update->find($_POST['id']);
         $update->name       = $_POST['name'];
         $update->url        = $_POST['url'];
         $update->contact    = $_POST['contact'];
         $update->address    = $_POST['address'];
         $update->phone        = $_POST['phone'];
         $update->email        = $_POST['email'];
         $update->save();

         $error = "The Publisher has been edited";   
                }
   }
  }

im using a function which connects to a db called 'comments' and then inside that function i again called another function that will connect to the db 'main' to get avatars.... but as i put Code: [Select]
mysql_select_db("main") or die(mysql_error()); on the new function, the original function stops to fetch rows.

i tried to remove "mysql_select_db("main") or die(mysql_error());" and used the new function to return some text only and it worked, so i guess the connection to the db was the problem... i tried doing Code: [Select]
mysql_query("SELECT * FROM  main.avatar
INNER JOIN main.list ON main.avatar.title=main.list.id
WHERE main.avatar.page_id='$id'"); but it also didnt work