hashing a string

Hello i was wondering if the following code is easily reversible:

PHP Code:

---

string jhash(string str)
{
    unsigned int i;
    for(i = 0; i < str.length()-1; i++)
        str[i] >>= str[i+1];
    for(i = 1; i < str.length(); i++)
        str[i] += str[i-1];
    for(i = 0; i < str.length()-1; i++)
        str[i] <<= str[i+1];
    for(i = 1; i < str.length(); i++)
        str[i] ^= str[i-1];
    return str;
} 


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Thanks for your help.
:)

No its not reversable at all.
Using the shift operator >> loses bits.
If you remove the 2 loops that use shift operators then the hashing can be reversed.

alright, i just wanted to make a quick unreversible string hash for use in an application i'm working on : )