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PHP has a total of 46 registered hashing algorithms among which “sha1”, “sha256”, “md5”, “haval160, 4” are the most popular ones. $string: This parameter expects the string to be hashed. $getRawOutput: This optional parameter expects a boolean value, on TRUE the function returns the hash in a raw binary format.
PHP offers the built-in function hash() . The first argument to the function is the algorithm name (you can pass algorithm names like sha256, sha512, md5, sha1, and many others).
we use md5 as a hashing algorithm in many parts of our code.
security in this context is NOT an issue. we just use md5 as a method of generating a unique identifier to store various items in apc etc.
collisions are an issue. although unlikely, it would cause some major issues.
anyone want to suggest something lighter on the cpu?
thanks.
we have just done some testing with md5 vs crc32.
using the following snippet:
<?
$start=microtime(true);
for($i=1;$i<=1000000;$i++){
md5(rand(10000000,99999999)); <--- crc32 tested here too.
}
$end=microtime(true);
echo $end-$start."\n";
?>
there results are as follow:
md5:
1.4991459846497
1.7893800735474
1.4672470092773
crc32:
0.97880411148071
0.94331979751587
0.93316197395325
so it would appear crc32 is about 1/3 faster then using md5.
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