wifi channel and frequency list

Channel Frequency(MHz)
1 2412
2 2417
3 2422
4 2427
5 2432
6 2437
7 2442
8 2447
9 2452
10 2457
11 2462
12 2467
13 2472
14 2484
36 5180
40 5200
44 5220
48 5240
52 5260
56 5280
60 5300
64 5320
100 5500
104 5520
108 5540
112 5560
116 5580
120 5600
124 5620
128 5640
132 5660
136 5680
140 5700
149 5745
153 5765
157 5785
161 5805
165 5825

5Ghz WiFi Channels (US)

Source: http://www.revolutionwifi.net/blog/?month=april-2014&view=calendar

convert pdf to png gray

gs -sDEVICE=pnggray -sOutputFile=page-%03d.png -r600x600   -f test-ecg.pdf

Turn your PHP project to a standalone Windows application

Free and Open source ones:

1. PHP Desktop (I tried it and it works really well)
https://code.google.com/p/phpdesktop/

2. http://sourceforge.net/projects/wapache/

3. https://github.com/naetech/nightrain

Paid ones:
http://www.zzee.com/phpexe/