10 numbers	genRandomString(10, "0123456789")
50 numbers	genRandomString(50, "0123456789")
8 chars	genRandomString(8)
16 chars	genRandomString(16)
24 chars	genRandomString(24)
32 chars	genRandomString(32)
64 chars	genRandomString(64)
128 chars	genRandomString(128)
8 symbols	htmlspecialchars(genRandomString(8, symbols))
16 symbols	htmlspecialchars(genRandomString(16, symbols))
24 symbols	htmlspecialchars(genRandomString(24, symbols))
32 symbols	htmlspecialchars(genRandomString(32, symbols))
64 symbols	htmlspecialchars(genRandomString(64, symbols))