M_PI : 3.1415926535898
abs(-3.5): 3.5
base_convert("60",10,16): 3c
pow(2.5,2): 6.25
exp(2): 7.3890560989307
25 % 7: 4
fmod(2.8,1.5): 1.3
log(2.7): 0.99325177301028
log(16,2): 4
log(1000,10): 3
log10(1000): 3
Now random numbers:

rand(): 136198707
Another call for rand(): 698133248
Click refresh to see if the next time you'll get the same values returned by rand or not.
rand(150,1000): 155
getrandmax(): 2147483647
mt_getrandmax(): 2147483647
lcg_value:0.62713324637516
Another call for lcg_value:0.71423353897689
Click refresh to see if the next time you'll get the same values returned by lcg_value or not.
mt_rand(): 997460075
Another call for mt_rand(): 309677323
Click refresh to see if the next time you'll get the same values returned by rand or not.
mt_rand(150,1000): 745