Here is a cool little thing, we use xor to change values of two variables, without a temp. variable, function or anything else:
php > $a = 'a'; $b = 'b'; php > $a = $a ^ $b; php > $b = $a ^ $b; php > $a = $a ^ $b; php > print $a; b php > print $b; a
Archive for February, 2010
Swap values of two variables
Wednesday, February 24th, 2010MySQL escaping
Tuesday, February 23rd, 2010Every now and then I see some sites that fails to input/output data from the database, like: don\’t.
My heart hurts every time, and it’s not just small pages, it’s big community/news pages as well.
The reason why this happens, is that people forget to check if magic_quotes_gpc are true. magic_quotes_gpc is a setting in php.ini and will escape input automaticly from GET, POST and COOKIE. If this setting is on (and in many cases it is) and then use mysql_real_escape_string as well, it will result in double escaping. On output some people tend to forget to strip slashes.
I have made these filter functions to show how it could be done, but there are always better alternatives.
<?php
function mysql_in($data) {
if(get_magic_quotes_gpc()) {
$data = stripslashes($data);
}
return mysql_real_escape_string($data);
}
function mysql_out($data) {
$data = stripslashes($data);
//$data = htmlspecialchars($data);
//$data = nl2br($data);
return $data;
}
?>
Why Cal Henderson hates Django
Tuesday, February 23rd, 2010Cal Henderson talks about why he hates Django. It’s very entertaining and good learning :)
IRC on numb3rs
Saturday, February 20th, 2010“IRC! Internet Relay Chat. It’s how hackers talk when they don’t want to be overheard.”
“Can we see what they’re saying?”
“In leet speak. Luckily, I speak leet.”
“Thats so hot.”
I laughed :)
NetCom USB Modem (ZTE MF636) on Ubuntu
Thursday, February 18th, 2010This guide is to make the ZTE MF636 USB modem work with Ubuntu 9.10 (“Karmic”). I made this guide of many other guides out there, but only with the combination of them all I got it to work for me. I have the Norwegian NetCom operator, but it should work with others as well.
Step 1
In Linux, the USB-modem is considered as a storage device, so we need to make sure that it is seen as a modem instead.
First download gtkterm:
sudo apt-get install gtkterm
Find the correct USB device:
ls /dev | grep ttyUSB
The last device listed is probably the one. Now edit the config file.
Make sure to replace the X in USBX you got earlier:
gedit ~/.gtktermrc
Copy / paste:
[default] port = /dev/ttyUSBX speed = 115200 bits = 8 stopbits = 1 parity = none flow = none wait_delay = 0 wait_char = -1 echo = False crlfauto = False font = "Nimbus Mono L, 14" term_transparency = False term_show_cursor = True term_rows = 80 term_columns = 25 term_visual_bell = True term_foreground_red = 43253 term_foreground_blue = 43253 term_foreground_green = 43253 term_background_red = 0 term_background_blue = 0 term_background_green = 0 term_background_saturation = 0,500000
Open gtkterm (Accessories->Serial port terminal) and go to configuration and check ‘Local echo’. Then write:
AT+ZOPRT=5 AT+ZCDRUN=8
You will get “Close autorun state result(0:FAIL 1:SUCCESS):1″ if it went well.
Step 2
Install Gnome-ppp:
sudo apt-get install gnome-ppp
Edit the following config file:
gedit /etc/wvdial.conf
Copy / paste: (Here also change the X)
[Dialer Defaults] Modem = /dev/ttyUSBX ISDN = 0 Modem Type = Analog Modem Baud = 460800 Init1 = ATZ Init2 = AT&F &D2 &C1 Init3 = ATS7=60 S30=0 S0=0 Phone = *99# Dial Attempts = 1 Dial Command = ATM1L3DT Ask Password = off Password = netcom Username = netcom Auto Reconnect = off Stupid Mode = 1
Edit another config file:
sudo gedit /etc/init.d/rc.local
add:
modprobe -r usbserial modprobe usbserial vendor=0x19d2 product=0x0031
Unplugg modem. Reboot. Plugin modem.
Now we need to run gnome-ppp with root access:
sudo wvdial
If everything went well, you will get something like this:
echofish@ubuntu:/dev$ sudo wvdial --> WvDial: Internet dialer version 1.60 --> Cannot get information for serial port. --> Initializing modem. --> Sending: ATZ ATZ OK --> Modem initialized. --> Sending: ATM1L3DT*99# --> Waiting for carrier. ATM1L3DT*99# CONNECT --> Carrier detected. Starting PPP immediately. --> Starting pppd at Sat Nov 7 21:35:46 2009 --> Pid of pppd: 5709 --> Using interface ppp0 --> local IP address 89.9.97.35 --> remote IP address 10.64.64.64 --> primary DNS address 212.169.123.67 --> secondary DNS address 212.45.188.254</pre>
Happy surfing!
(To restore the modem to default, just write AT+ZCDRUN=9 to it.)