which function can get string from md5 hash

[mshen]

md5 calculate the md5 hash of a string.

which function can get string from md5 hash.

[laserlight]

md5() in PHP calculates the md5 hash of its string argument and returns it as a hexadecimal string.

EDIT:
are you asking for the reverse of the md5 algorithm?
there arent any available, though some say md5 is weak enough such that analysis may allow one to come up with a string that produces a collision for the given hash.
That's not what you want though.

[phpprogrammer]

Dear Friend,

there is no such function in php to get the original string from a md5string

regards
bvsureshbabu

[laserlight]

actually, there should be no function anywhere to get the original string from the hash.

[novazero]

MD5 is a ONE-WAY message digest hash. If you could generate the original string from MD5 hash, SSL encryption would be useless because anyone could figure out the password for the CA Root certificate and fake it.