Does PHP have access to internet?
I believe so because it can retrieve data from BTC-E in the beginning
BTC-E Arbitrage Bot v0.1 (CTRL+C to exit)
Trade amount (min/increment/max): 0.01 / 0.02 / 0.06
Minimum profit: 1 %
Price margin: 1.05
Delay between checks: 200 ms
Min time between trades: 10 s
14:11:58 Balance: X USD, X BTC, X LTC
I restart it from time to time to make sure API is not banned by BTC-E