sha1_file Calculate the sha1 hash of a file &reftitle.description; stringsha1_file stringfilename boolraw_outputfalse Calculates the sha1 hash of the file specified by filename using the US Secure Hash Algorithm 1, and returns that hash. The hash is a 40-character hexadecimal number. &reftitle.parameters; filename The filename of the file to hash. raw_output When &true;, returns the digest in raw binary format with a length of 20. &reftitle.returnvalues; Returns a string on success, &false; otherwise. &reftitle.examples; ]]> &reftitle.changelog; &Version; &Description; 5.0.0 Added the raw_output parameter 5.1.0 Changed the function to use the streams API. It means that you can use it with wrappers, like sha1_file('http://example.com/..') &reftitle.seealso; sha1 md5_file crc32