Php method for file hash computation _ PHP Tutorial

Php performs the hash operation on files. Php performs the following hash operation on files: this code is very useful. if you download an object, the website provides the hash result, you can perform the php hash operation on the downloaded file.

The details are as follows:

This code is very useful. if you download a file and the website provides the hash result, you can perform a hash operation on the downloaded file to verify that the downloaded file is correct.

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Hash (Check) Files If (! Empty ($ _ FILES )){ If ($ _ FILES ["file"] ["error"]> 0 ){ Switch ($ _ FILES ["file"] ["error"]) { Case 1: Echo"Error: The uploaded file exceeds the upload_max_filesize directive in php. ini "; Break; Case 2: Echo"Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form. "; Break; Case 3: Echo"Error: The uploaded file was only partially uploaded. "; Break; Case 4: Echo"Error: No file was uploaded. "; Break; Case 6: Echo"Error: Missing a temporary folder. "; Break; Case 7: Echo"Error: Failed to write file to disk. "; Break; Case 8: Echo"Error: a php extension stopped the file upload. "; Break; Default: Echo"Unknown error occured. "; } } Else { Echo 'upload: '. $ _ FILES ['file'] ['name'].' '; Echo 'type: '. $ _ FILES ['file'] ['type'].' '; Echo 'Size: '. (round ($ _ FILES ['file'] ['size']/1024, 2). 'kb '; If (array_search ($ _ POST ['algo'], hash_algos () = false ){ Echo 'unknown hashing algorithm requested. '; } Else { Echo 'hashing Algorithm: '. $ _ POST ['algo'].' '; $ Hash = hash_file ($ _ POST ['algo'], $ _ FILES ['file'] ['tmp _ name']); Echo 'calculated hash: '. $ hash .' '; If ($ _ POST ['expash ']! = 'None '&&! Empty ($ _ POST ['expyash ']) { Echo 'expected hash: '. $ _ POST ['expyash'].' '; Echo ($ hash = $ _ POST ['expyash '])? 'Hash matched expected value.':'Hash did not match expected value.'; Echo' '; } } } ?> Again } Else { ?> } ?>

Example: This code is very useful. if you download an object and the website provides the hash result, you can download the downloaded file...