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PHP Compare Multi-dimensional Array Function

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For more information, see php.net, under usort

It works with dates

Replace 0 for the array's key you want to sort. For example, if you have a start_date array key you would like to compare, then you would replace 0 for start_date.

If you want to do a reverse sort, just switch the -1 and 1.

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  1. function compare ($a, $b) {
  2. 	//return strcmp($a["fruit"], $b["fruit"]);
  3. 	// in the case of the above array
  4. 	// note we are comparing the first element of each array
  5. 	if ( $a[0] < $b[0] ) {
  6. 		return -1;
  7. 	}
  8. 	if ( $a[0] > $b[0] ) {
  9. 		return 1;
  10. 	}
  11. 	// they are equal
  12. 	return 0;
  13. }
  14.  
  15. usort($events, 'compare');

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