Take Screenshot from Command Line
To take a screenshot from command line (even from ssh connection) in a system running X server: xwd -out screenshot.xwd -root -display :0.0 More about xwd here. More options here.
How to Get Current Datetime (NOW) with PHP
To get current datetime (now) with PHP you can use date with any PHP version, or better datetime class with PHP >= 5.2 Various date format expressions are available here.…
How to find whether a variable is positive integer with PHP
PHP is_numeric() is useful to find whether a variable is a number or a numeric string. How you can check if a variable is an integer? You may use the…
Massive Change of File Permissions
Use the powerful find command with exec parameter to change permissions using chmod. To change permissions to 644 for all files in /path/to, use the following command: find /path/to -type…
Passing Array Variables using POST or GET with PHP
A convenient way to pass a single or multidimensional (possible utf-8) array is to serialize it ("convert it to a string") and pass it using a hidden input. After post…