Beispiel
Berechnen Sie den MD5 - Hash der Textdatei "test.txt" :
<?php
$filename = "test.txt";
$md5file = md5_file($filename);
echo $md5file;
?>Der Ausgang des Code oben wird sein:
d41d8cd98f00b204e9800998ecf8427e
Definition und Verwendung
Die md5_file() Funktion berechnet die MD5 - Hash einer Datei.
Die md5_file() Funktion verwendet die RSA Data Security, Inc. MD5 Message-Digest Algorithm.
Von RFC 1321 - Der MD5 Message-Digest Algorithm: "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." - "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." - "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." - "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." bei "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." - "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." , "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA." sie "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA."
Um den MD5 Hash einer Zeichenfolge zu berechnen, verwenden die md5() Funktion.
Syntax
md5_file( file,raw )
| Parameter | Beschreibung |
|---|---|
| file | Erforderlich. Die Datei berechnet werden |
| raw | Optional. Ein Boolescher Wert, hex oder binäres Ausgabeformat angibt:
|
Technische Details
| Rückgabewert: | Gibt den berechneten MD5-Hash bei Erfolg oder FALSE bei einem Fehler |
|---|---|
| PHP Version: | 4.2.0+ |
| Änderungsprotokoll: | Der rohe Parameter wurde in PHP 5.0 hinzugefügt Ab PHP 5.1 ist es möglich , verwenden md5_file() mit Wrapper, zB md5_file("http://w3ii.com/..") |
Mehr Beispiele
Beispiel 1
Lagern Sie den MD5 - Hash "test.txt" in einer Datei:
<?php
$md5file = md5_file("test.txt");
file_put_contents("md5file.txt",$md5file);
?>Testen Sie, ob "test.txt" geändert wurde (das heißt , wenn der MD5 - Hash geändert wurde):
<?php
$md5file = file_get_contents("md5file.txt");
if (md5_file("test.txt") == $md5file)
{
echo "The file is ok.";
}
else
{
echo "The file has been changed.";
}
?>Der Ausgang des obigen Code könnten sein:
The file is ok.
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