PHP MD5 Code _php tutorial to get uploaded files

Since it is necessary to determine if the uploaded file has been modified, the MD5 value of the uploaded file needs to be recorded, and the method of obtaining the MD5 value of the file is recorded here.

if (Isset ($_files[' Multimedia ')) && $_files[' multimedia ' [' ERROR ']==0] {$file _name = $_files[' multimedia '] [' Name ']; $size = getimagesize ($_files[' multimedia ' [' tmp_name ']);    $type = $_files[' multimedia ' [' type ']; $original = $_files[' multimedia ' [' tmp_name ']; $MD 5 = Md5_file ($original); echo $ MD5;}

Md5_file ()

The Md5_file () function computes the MD5 hash of the file. The MD5 () function uses RSA data security, including the MD5 message selected passage algorithm. If successful, returns the computed MD5 hash, or False if it fails.

Syntax: MD5 (STRING,RAW)

• Parameter string, required. Specify the documents to be calculated.
• Parameter charlist, optional. Specify hexadecimal or binary output format: TRUE-original 16 character binary format; FALSE-Default. 32 character hexadecimal number.

To store the MD5 hash of the "test.txt" file:

In this example, we will detect if "test.txt" has been changed (that is, if the MD5 hash has been changed):

Output:

The file is OK.

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