upload immagini

[dttah]

ciao a tutti, ho fatto uno script per uploadare immagini adesso però mi trovo qui:

if(file_exists($upload_dir.$file_name)){
                                 echo"gia esiste...";
                             }else 

ho fatto un semplice echo ma come posso fare per rinominare il file in una cosa qualsiasi? per esempio se il nome file è: rosso , lo deve transformare in una stringa casuale del tipo rossosas21

grazie ciao

[marco80]

Aggiungi al nome esistente un uniqid(); http://it.php.net/manual/it/function.uniqid.php
Non ho capito se devi rinominare il file già esistente.
Ps se da rinominare devi tenere ovviamente l'estensione come parte finale , quindi riconoscerla prima per rimetterla poi alla fine del nome.

[dttah]

no devo rinominare il file che sto uploadando nel caso in cui ci sia un file con lo stesso nome

[marco80]

if(file_exists($upload_dir.$file_name)){
//$file_name assegnato dai dati del form...                                 
//$file_name e' img.jpg
list($nome,$type) = explode('.',$file_name);

$file_name = $nome.uniqid().'.'.$type;
//upload con nuovo nome
                             }else{
//upload 
} 

[dttah]

                             if(file_exists($upload_dir.$file_name)){
                                  //$file_name assegnato dai dati del form...                                 
                                   //$file_name e' img.jpg
                                list($nome,$type) = explode('.',$file_name);
                                 $file_name = $nome.uniqid().'.'.$type;
                              if (move_uploaded_file($file_tmp,$upload_dir.$file_name)) {
                                       echo "<font color=\"#FF0000\">File $i: ($file_name) Uploaded.
</font>";
                                       echo"
";
                                       echo"<a href=\"http://www.oplayers.net/public/upload/images/$file_name\"><img src=\"http://www.oplayers.net/public/upload/images/$file_name\" width=\"119\" height=\"119\" border=\"2\"></a>";
                                       echo"

";
                                       echo "link html: <input name=\"textfield\" value=\"&lt;img src=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot;&gt;\" size=\"100\">";
                                       echo"
";
                                       echo"link diretto:<input name=\"textfield\" value=\"http://www.oplayers.net/public/upload/images/$file_name\" size=\"100\">";
                                       echo"
";
                                       echo"Thumbnail:<input name=\"textfield\" type=\"text\" value=\"&lt;a href=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot;&gt;&lt;img src=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot; width=&quot;119&quot; height=&quot;119&quot; border=&quot;2&quot;&gt;&lt;/a&gt;\" size=\"100\">

";
                                       }
                             }else{
                                   #-----------------------------------------------------------#
                                   # this function will upload the files.  :) ;) cool          #
                                   #-----------------------------------------------------------#
                                   if (move_uploaded_file($file_tmp,$upload_dir.$file_name)) {
                                       echo "<font color=\"#FF0000\">File $i: ($file_name) Uploaded.
</font>";
                                       echo"
";
                                       echo"<a href=\"http://www.oplayers.net/public/upload/images/$file_name\"><img src=\"http://www.oplayers.net/public/upload/images/$file_name\" width=\"119\" height=\"119\" border=\"2\"></a>";
                                       echo"

";
                                       echo "link html: <input name=\"textfield\" value=\"&lt;img src=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot;&gt;\" size=\"100\">";
                                       echo"
";
                                       echo"link diretto:<input name=\"textfield\" value=\"http://www.oplayers.net/public/upload/images/$file_name\" size=\"100\">";
                                       echo"
";
                                       echo"Thumbnail:<input name=\"textfield\" type=\"text\" value=\"&lt;a href=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot;&gt;&lt;img src=&quot;[url]http://www.oplayers.net/public/upload/images/[/url]$file_name&quot; width=&quot;119&quot; height=&quot;119&quot; border=&quot;2&quot;&gt;&lt;/a&gt;\" size=\"100\">

";
                                                                          }else{
                                        echo "File $i: Faild to upload.
";
                                   } 

in questo modo me li sovrascrive dove sbaglio?