How to rename files dynamically in upload?

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I have the following code and do not know how to change it to dynamically rename the image at the time of upload.

PHP

<?php
$uploaddir = './fotos/';
$uploadfile = $uploaddir . basename($_FILES['userfile']['name']);

echo '<pre>';
if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {
    echo "Arquivo válido e enviado com sucesso.\n";
} else {
    echo "Possível ataque de upload de arquivo!\n";
}

echo 'Aqui está mais informações de debug:';
print_r($_FILES);

print "</pre>";
?>
php

  • You know what your code does line by line?

  • @Andersoncarloswoss yes. I do. rss

  • @Andersoncarloswoss I have difficulty implementing md5 to generate random names for images.

  • So how do you think you change the file name?

  • @Andersoncarloswoss I believe capturing the file name, renaming and sending to the line move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile). Is that?

  • Exactly. If you look at documentation, the second parameter of move_uploaded_file is $destination, referring to the final file name. The name you give it here will be written to disk.

  • Let’s go continue this discussion in chat.

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1 answer

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You can use the function md5 along with the [microtime][2] to generate unique names for each image.

<?php

$currentName = $_FILES['userfile']['name'];
$parts = explode(".", $currentName);
$extension = array_pop($parts);

$newName = md5($currentName . microtime());
$destination = "./fotos/{$newName}.{$extension}";

if (move_uploaded_file($_FILES['userfile']['tmp_name'], $destination)) {
    // ...
}

This way, the new file name will be the result of md5 of the current name concatenated with the return of microtime, preventing (practically) any conflict between the generated names.

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