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php Programming Glossary: collisionshttp://stackoverflow.com/questions/10057671/how-foreach-actually-works Now remember that a hash is just that A hash. I.e. it has collisions. So let's first try the following snippet array 'EzEz' 1 'EzFY'..
http://stackoverflow.com/questions/1075409/creating-your-own-tinyurl 679 616 unique values 5 gives you 60 466 176 the chance of collisions is small indeed it's a desired part of the design and a good..
PHP short unique ID generation using auto_increment? http://stackoverflow.com/questions/1650185/php-short-unique-id-generation-using-auto-increment to generate a short unique ID without having to check for collisions. I currently do something like this but the ID I currently generate.. but the ID I currently generate is random and checking for collisions in a loop is annoying and will get expensive if the number of.. of records grows significantly. Normally worrying about collisions isn't an issue but the unique ID I want to generate is a short..
List of Big-O for PHP functions http://stackoverflow.com/questions/2473989/list-of-big-o-for-php-functions really close to O 1 this is because of linear polling in collisions but because the chance of collisions is very small the coefficient.. of linear polling in collisions but because the chance of collisions is very small the coefficient is also very small. I find you..
Generate unique random alphanumeric characters that are 7 characters long http://stackoverflow.com/questions/2799495/generate-unique-random-alphanumeric-characters-that-are-7-characters-long be random. Therefore your best bet would be to detect collisions and just retry which could be very expensive in your particular.. that the sequence space is larger hence there will be less collisions. You can pick the size of the hash function according to the..
Hash Collision - what are the chances? http://stackoverflow.com/questions/297960/hash-collision-what-are-the-chances to be fairly good so I don't think you need to worry about collisions at all. As a side note use PHP's raw_output feature when you..
http://stackoverflow.com/questions/307486/short-unique-id-in-php of items because this could get pretty slow the more collisions you get getting an ID already in the table . Of course you'll..
http://stackoverflow.com/questions/3384204/what-are-namespaces With namespaces we can avoid the headache of naming collisions when mixing third party code with our own projects. share improve..
Exotic names for methods, constants, variables and fields - Bug or Feature? http://stackoverflow.com/questions/3417180/exotic-names-for-methods-constants-variables-and-fields-bug-or-feature case insensitivity. We might actually run into unexpected collisions because all the bytes that compose a multi byte character are..
Many hash iterations: append salt every time? http://stackoverflow.com/questions/3559437/many-hash-iterations-append-salt-every-time entire process Key Strengthening As for the degenerating collisions the only source I could find so far is this discussion ... And..
Fastest hash for non-cryptographic uses? http://stackoverflow.com/questions/3665247/fastest-hash-for-non-cryptographic-uses But you should be aware that CRC32 will have more collisions than MD5 or even SHA 1 hashes simply because of the reduced..
http://stackoverflow.com/questions/4983915/is-time-a-good-salt preferably within a salt space large enough to make collisions improbable two instances using the same salt value . It is tempting..
Generate random 5 characters string http://stackoverflow.com/questions/5438760/generate-random-5-characters-string rand . seed k Example And for one based on the clock fewer collisions since it's incremental function incrementalHash len 5 charset..
CodeIgniter session cookie domain http://stackoverflow.com/questions/5783595/codeigniter-session-cookie-domain 'cookie_prefix' Set a prefix if you need to avoid collisions 'cookie_domain' Set to .your domain.com for site wide cookies..
is there a way to reverse a hash without rainbow tables? [duplicate] http://stackoverflow.com/questions/7523625/is-there-a-way-to-reverse-a-hash-without-rainbow-tables the same output. So if hash a x and hash b x a and b are collisions of each other. So all we need to do is find a collision which..
http://stackoverflow.com/questions/9143101/can-i-md5sha1password hashed before. It will however only increase the risk of collisions because you're now working on a smaller dataset. What are you..
How to design a sequential hash-like function http://stackoverflow.com/questions/9804100/how-to-design-a-sequential-hash-like-function a number into a hash that has 4 charactors without any collisions until 62 62 62 62 14776336 entries For example the first entry..
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