Last Updated on Wednesday, 04 April 2012 06:10

save time to hardware clock hwclock linux centos

To save current time to hardware clock ( hwclock ) in linux to the following:

First set the current time the format is : MMDDhhmmCCYY

• MM: Month in 2 characters: 04
• DD: Day in 2 characters: 23
• hh: hours in 2 characters: 06
• mm: month in 2 characters: 04 ( April )
• CC: Century for 2012 it would be "20"
• YY: Year for 2012 it would be "12"

the command is date (space) and the MMDDhhmmCCYY format.

Example: date 042306512012

Second save the current time to Centos Linux Server Hardware Clock ( hwclock )

hwclock --systohc

To check the hardware clock ( hwclock ) that you have actually saved the time do this:

hwclock --show

Last Updated on Tuesday, 03 April 2012 11:16

Sort array by value in a field

Sort array by value in a field

/*
* Function to sort an array by value in a field
*
* @version	12.04.03 April 3, 2012
* @author	Mike Zriel
* 
* @params
* &$array	The array of fields to be sorted (passed by reference)
* $field	The name of the field to sort the array by
* $order	The order to sort the array in 
*/
function sortArrayByField( &$array, $field, $order = "ASC" ){
	/*
	* Build the comparison function depending on the
	* order specified. The function calls a strcmp
	* on two array element fields
	*/
	if ($order === "DESC")
		$comparison = "return -strcmp(\$a['{$field}'],\$b['{$field}']);";
	else
		$comparison = "return strcmp(\$a['{$field}'],\$b['{$field}']);";
	
	// Run the sort 
	usort($array, create_function('$a,$b', $comparison)); 
}