How to decrypt a message using AES ALGORITHM

[arbariya]

Hello, evey one

I have some data which is encrypted using AES ALGORITHM, now I want to decrypt it using AES algo in PHP, my problem is that I donot know what to take as my IV (initialisation vector)

if anybody has done this before please let me know

Thanx

[laserlight]

The IV should have been passed along with the ciphertext.