setlocale
If you've got a script that allows user file upload, and you want to prevent multiple uploads of the same file:
<?
session_start();
$isDuplicate = false;
if(isset($_FILES["filename"]["tmp_name"]) && file_exists($_FILES["filename"]["tmp_name"])) {
$fileHash = sha1_file($_FILES["filename"]["tmp_name"]);
if(!isset($_SESSION["check_filelist"])) {
$_SESSION["check_filelist"] = array($fileHash);
}
elseif(in_array($fileHash,$_SESSION["check_filelist"])) {
$isDuplicate = true;
}
else {
$_SESSION["check_filelist"][] = $fileHash;
}
if($isDuplicate) {
echo "You've already uploaded that file";
}
else{
// do some stuff
}
}
?>
sha1_file
(PHP 4 >= 4.3.0, PHP 5, PECL hash:1.1-1.3)
sha1_file — Calcular el resumen criptográfico sha1 de un archivo
Descripción
string sha1_file
( string $nombre_archivo
[, bool $salida_pura
] )
Calcula el resumen criptográfico sha1 de nombre_archivo usando el » Algoritmo de Hash Seguro US 1, y devuelve ese resumen. El resumen criptográfico es un número hexadecimal de 40 caracteres.
Lista de parámetros
- nombre_archivo
-
El nombre de archivo
- salida_pura
-
Cuando es TRUE, devuelve el resumen en un formato binario primitivo, con una longitud de 20. Su valor predeterminado es FALSE.
Valores retornados
Devuelve una cadena en caso de éxito, FALSE de lo contrario.
Registro de cambios
| Versión | Descripción |
|---|---|
| 5.0.0 | Se agregó el parámetro salida_pura |
| 5.1.0 | Se modificó la función para usar la API de secuencias. Esto quiere decir que es posible usarla con envolturas, como sha1_file('http://example.com/..') |
add a note
User Contributed Notessha1_file
schiros at invisihosting dot com
06-Sep-2007 07:02
06-Sep-2007 07:02
admin at cmsrevolution dot com
04-Aug-2006 08:02
04-Aug-2006 08:02
checking the sha1 of the file. ideal for download scripts making sure the file the user is downloading is not currupt
by checking the sha1 key
<?php
$filename = './Path/To/Your/File.zip';
if (file_exists($filename)) {
echo"i see the file";
} else {
echo "recheck the link file maybe broken";
}
$file = sha1_file('./Path/To/Your/File.zip');
echo"<br>is file hash valid?";
echo"hash = add the hash here<br>";
echo"hash of file :";
print($file);
?>
gubatron at gmail dot com
10-Feb-2006 07:02
10-Feb-2006 07:02
P2P programs like LimeWire utilize sha1 to identify files. However they do it in base32. Here's an utility class if you want to write a Gnutella client in PHP5
/**
Utility base32 SHA1 class for PHP5
Copyright (C) 2006 Karl Magdsick (original author for Python)
Angel Leon (ported to PHP5)
Lime Wire LLC
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
class SHA1 {
static $BASE32_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
/** Given a file it creates a magnetmix */
static function fileSHA1($file) {
$raw = sha1_file($file,true);
return SHA1::base32encode($raw);
} //fileSHA1
/** Takes raw input and converts it to base32 */
static function base32encode($input) {
$output = '';
$position = 0;
$storedData = 0;
$storedBitCount = 0;
$index = 0;
while ($index < strlen($input)) {
$storedData <<= 8;
$storedData += ord($input[$index]);
$storedBitCount += 8;
$index += 1;
//take as much data as possible out of storedData
while ($storedBitCount >= 5) {
$storedBitCount -= 5;
$output .= SHA1::$BASE32_ALPHABET[$storedData >> $storedBitCount];
$storedData &= ((1 << $storedBitCount) - 1);
}
} //while
//deal with leftover data
if ($storedBitCount > 0) {
$storedData <<= (5-$storedBitCount);
$output .= SHA1::$BASE32_ALPHABET[$storedData];
}
return $output;
} //base32encode
}