Exemplu
Se calculează MD5 hash al fișierului text "test.txt" :
<?php
$filename = "test.txt";
$md5file = md5_file($filename);
echo $md5file;
?>Ieșirea codului de mai sus va fi:
d41d8cd98f00b204e9800998ecf8427e
Definiție și utilizare
md5_file() funcția calculează MD5 hash a unui fișier.
md5_file() funcția utilizează RSA Data Security, Inc. MD5 Message-Digest algoritm.
De la RFC 1321 - MD5 Message-Digest algoritm: "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." de "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." în "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." în "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." de a "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." în "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."
Pentru a calcula hash MD5 al unui șir de caractere, utilizați md5() funcția.
Sintaxă
md5_file( file,raw )
| Parametru | Descriere |
|---|---|
| file | Necesar. Fișierul care urmează să fie calculate |
| raw | Opțional. O valoare boolean care specifică hex sau formatul de ieșire binar:
|
Detalii tehnice
| Întoarcere Valoare: | Returnează hash MD5 calculat pe un succes, sau FALSE în caz de eșec |
|---|---|
| Versiune PHP: | 4.2.0+ |
| Changelog: | Parametrul brut a fost adăugat în PHP 5.0 Ca de PHP 5.1, este posibil să se utilizeze md5_file() cu ambalaje, de exemplu , md5_file("http://w3ii.com/..") |
Mai multe exemple
Exemplul 1
Păstrați hash MD5 "test.txt" într - un fișier:
<?php
$md5file = md5_file("test.txt");
file_put_contents("md5file.txt",$md5file);
?>Testul în cazul în care "test.txt" a fost modificat ( în cazul în care este hash MD5 a fost modificat):
<?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.";
}
?>Ieșirea codului de mai sus ar putea fi:
The file is ok.
<PHP String Reference