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    <p>open the file in binary mode for writing, write 1's over the entire file, close the file, and then unlink it. overwrites any data within the file so it cannot be recovered.</p> <p>Personally i would say use 1's instead of 0's as 1's are actual data and will always write, where as 0's may not write, depending on several factors.</p> <p><strong>Edit:</strong> After some thought, and reading of comments, i would go with a hybrid approach, depending on "how deleted" you want the file to be, if you simply wish to make it so the data cannot be recovered, overwrite the entire files length with 1's as this is fast, and destroys the data, the problem with this, is it leaves a set length of uniform data on the disk which infers a file USED to be there and gives away the files length, giving vital pieces of forensic information. Simply writing random data will not avoid this also, as if all the drive sectors around this file are untouched, this will also leave a forensic trace.</p> <p>The best solution factoring in <em>forensic deletion, obfuscation and plausible deniability</em> (again, this is overkill, but im adding it for the sake of adding it), overwrite the entire length of the file with 1's and then, for HALF the length of the file in bytes, write from <code>mt_rand</code> in random length sizes, from random starting points, leaving the impression that many files of varying lengths used to be in this area, thus creating a false trail. (again, this is completely overkill and is generally only needed by serial killers and the CIA, but im adding it for the sake of doing so).</p>
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    1. POcompletely deleting a file from server
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    1. COGood idea, did you tested that? what is diff between overwriting or truncating to zero length? because when you edit same file OS will update the index on the storage...
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    2. COtruncating to zero length only alters the metadata/file table depending on the file system, overwriting, and then unlinking completely destroys the data on disk making sure it cannot come back
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    3. COOr let's use `mt_rand()` to write random numbers ! Btw you're wanted in the php chatroom :)
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