Benchmarks for mt_rand() and rand()

Benchmarks results as below:

mt_rand() 10000000 times for 4.7026278972626 seconds
each one average is 0.00000047 seconds
rand() 10000000 times for 4.7438910007477 seconds
each one average is 0.00000047 seconds

The test machine is Amazon EC2 High-CPU Instances (20 ECU)

Another test as below:

mt_rand() 10000000 times for 2.4974269866943 seconds
each one average is 0.00000025 seconds
rand() 10000000 times for 2.4646849632263 seconds
each one average is 0.00000025 seconds

The test machine is Amazon EC2 Micro Instances (1 ECU)