13.15. File Checksums
PHP's sha1_file( ) function creates a checksum hash value using the SHA1 algorithm. To use it, pass the filename and capture the return value, like this:
$sha1 = sha1_file($filename);
For MD5 hashing, you can use the function md5_file( ). It works in exactly the same way as sha1_file( ), except that it returns the MD5 hash as opposed to the SHA1 hash.
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