PHP Caricamento file e sovrascrittura file con lo stesso nome

Question

Sto creando un'applicazione che consente agli utenti di caricare un file in una directory tramite PHP.

Ho problemi perché la dose non mi consente di sovrascrivere i file con lo stesso nome. Ad esempio, ho un file chiamato text.php e lo carico, ora quando torno indietro e cambio il contenuto del file text.php e lo carico di nuovo sul server ho ancora la versione senza le modifiche. Tuttavia se carico un altro file funziona. Quindi non riesco a sovrascrivere i file.

if ($_POST["greg"]=='true'){ 
// Set local PHP vars from the POST vars sent from our form using the array 
// of data that the $_FILES global variable contains for this uploaded file 
$fileName = $_FILES["file1"]["name"]; // The file name 
$fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder 
$fileType = $_FILES["file1"]["type"]; // The type of file it is 
$fileSize = $_FILES["file1"]["size"]; // File size in bytes 
$fileErrorMsg = $_FILES["file1"]["error"]; // 0 for false... and 1 for true 

// Specific Error Handling if you need to run error checking 
if (!$fileTmpLoc) { // if file not chosen 
    echo "ERROR: Please browse for a file before clicking the upload button."; 
    exit(); 
} else if($fileSize > 90000000000000) { // if file is larger than we want to allow 
    echo "ERROR: Your file was larger than 50kb in file size."; 
    unlink($fileTmpLoc); 
    exit(); 
} else if (!preg_match("/.(doc|docx|xls)$/i", $fileName)) { 
    // This condition is only if you wish to allow uploading of specific file types  
    echo "ERROR: Your file is not the right format contact the master of the page for clarification."; 
    unlink($fileTmpLoc); 
    exit(); 
} 
// Place it into your "uploads" folder mow using the move_uploaded_file() function 
move_uploaded_file($fileTmpLoc, "documenti/$fileName"); 
// Check to make sure the uploaded file is in place where you want it 
if (!file_exists("documenti/$fileName")) { 
    echo "ERROR: File not uploaded<br /><br />"; 
    echo "Check folder permissions on the target uploads folder is 0755 or looser.<br /><br />"; 
    echo "Check that your php.ini settings are set to allow over 2 MB files, they are 2MB by default."; 
    exit(); 
} 
// Display things to the page so you can see what is happening for testing purposes 
echo "The file named <strong>$fileName</strong> uploaded successfuly.<br /><br />"; 
echo "It is <strong>$fileSize</strong> bytes in size.<br /><br />"; 
echo "It is a <strong>$fileType</strong> type of file.<br /><br />"; 
echo "The Error Message output for this upload is: <br />$fileErrorMsg"; 

} 

Come posso modificare il codice in modo che quando aggiungo un file con lo stesso nome sovrascrive il file esistente?

Answer 1

Prova questa (metterlo prima di caricare un file)

//checking if file exsists 
if(file_exists("documenti/$fileName")) unlink("documenti/$fileName"); 

//Place it into your "uploads" folder mow using the move_uploaded_file() function 
move_uploaded_file($fileTmpLoc, "documenti/$fileName"); 

Answer 2

Hai provato a verificare se il file esiste ed eliminarlo se lo fa prima di spostare il file temporaneo nel percorso di archiviazione permanente?

Answer 3

Forse lo script non ha i diritti per sovrascrivere? Prova a cambiare la directory su 777 e prova di nuovo. Se funziona, allora, si può capire il valore corretto è necessario

Answer 4

if (file_exists("documenti/$fileName")) 
{ 
unlink("documenti/$fileName"); 

echo "<font face='Verdana' size='2' >Last Uploaded File has been removed from uploads folder<br>back to uploadform agian and upload your file<br>";// now your file which uploaded before was deleted from uploads folder you can open it and check if it removed or not , so no you should go back to uploadform again and import your file which will uploaded correctly 

echo "<font face='Verdana' size='2' ><BR><BR><BR><a href='upform.php'>Back to upform</a><BR>"; 

}