Image Hosting Script [HELP] [PHP]

[NaziPhreak]

When a user uploads a image for example called "me.gif" , and when a different person uploads the image with
with the same name and extention that user over-writes the previous image and replaces it.

How do I make it so it will create a random upload name like from "example.png" to "18j2nx01.png" and it will continue
making random upload names so it will not over-write other images or how do I make it so it will inform a different user already has uploaded the same name and extention so you will need to change the name of the image file.I perfer the first one.

This is a image hostings script by M0nsta.

<?php
/*
Simple PHP OOP Image Upload script by m0nsta.
*/
class imgUploader
{
    var $exts = array( ".png", ".gif", ".png", ".jpg", ".jpeg" ); //all the extensions that will be allowed to be uploaded
    var $maxSize = 9999999; //if you set to "0" (no quotes), there will be no limit
    var $uploadTarget = "imageuploads/"; //make sure you have the '/' at the end
    var $fileName = ""; //this will be automatically set. you do not need to worry about this
    var $tmpName = ""; //this will be automatically set. you do not need to worry about this
    
    public function startUpload()
    {
        $this->fileName = $_FILES['uploaded']['name'];
        $this->tmpName = $_FILES['uploaded']['tmp_name'];
        if( !$this->isWritable() )
        {
            die( "Sorry, you must CHMOD your upload target to 777!" );
        }
        if( !$this->checkExt() )
        {
            die( "Sorry, you can not upload this filetype!" );
        }
        if( !$this->checkSize() )
        {
            die( "Sorry, the file you have attempted to upload is too large!" );
        }
        if( $this->fileExists() )
        {
            die( "Sorry, this file already exists on our servers!" );
        }
        if( $this->uploadIt() )
        {
         echo "Your file has been uploaded!<br><br>
Direct Link: <input name=\"direct\" size=\"70\" readonly=\"readonly\" value=\"http://". $_SERVER['HTTP_HOST'] ."/" . $this->uploadTarget . time() . $this->fileName . "\" / ><br><br>
BB Code: <input name=\"forum\" size=\"70\" readonly=\"readonly\"  value=\"[IMG]http://" . $_SERVER['HTTP_HOST'] . "/" . $this->uploadTarget . time . $this->fileName . "[/IMG]\" / ><br><br>
HTML Code: <input name=\"html\" size=\"70\" readonly=\"readonly\"  value=\"<img src=&quot;http://". $_SERVER['HTTP_HOST'] ."/" . $this->uploadTarget . time() . $this->fileName . "&quot;>\" /><br><br>
View image <a href=\"" . $this->uploadTarget . time() . $this->fileName . "\"><b>here</b></a>";  
        }
        else
        {
            echo "Sorry, your file could not be uploaded for some unknown reason!";
        }
    }
    
    public function uploadIt()
    {
        return ( move_uploaded_file( $this->tmpName, $this->uploadTarget . time() . $this->fileName ) ? true : false );
    }
    
    public function checkSize()
    {
        return ( ( filesize( $this->tmpName ) > $this->maxSize ) ? false : true );
    }
    
    public function getExt()
    {
        return strtolower( substr( $this->fileName, strpos( $this->fileName, "." ), strlen( $this->fileName ) - 1 ) );
    }
    
    public function checkExt()
    {
        return ( in_array( $this->getExt(), $this->exts ) ? true : false );
    }
    
    public function isWritable()
    {
        return ( is_writable( $this->uploadTarget ) );
    }
    
    public function fileExists()
    {
        return ( file_exists( $this->uploadTarget . time() . $this->fileName ) );
    }
}
$img = new imgUploader();



if( $_POST['upload_file'] )
{
    $img->startUpload();
}
else
{
    echo "<form method=\"post\" enctype=\"multipart/form-data\">
        <p>
            <label for=\"file\">Select a file to upload:</label> <input type=\"file\" name=\"uploaded\" id=\"file\"><br>
            <input type=\"submit\" name=\"upload_file\" value=\"Upload!\">
        <p>
    </form>";
}
?>

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[Kryptos]

Change

$this->fileName = $_FILES['uploaded']['name'];

to:

$this->fileName = rand(9, 99999) . '-file-' . $_FILES['uploaded']['name'];

That would stop it! Unless you expect to host more than 50,000 files!

 

[Markshall]

You could also do something as simple as:

Changing:

$this->fileName = $_FILES['uploaded']['name'];

To:

$this->fileName = mt_rand( 1, 9999 ) . substr( md5( $_FILES['uploaded']['name'] ), ( mt_rand( 1, 10 ), 8 ) ) . $this->getExt();

That should encrypt the file name in MD5 and select a random chunk of the MD5 string name. I've not tested it but it looks like it should work.