PHP syntax: sort an associative array by index keys

Posted December 28, 2003 by Quinn McHenry in PHP programming

Last Updated on

To sort an associative array by index values (or keys), use ksort.


An optional parameter (sort_flags) can be passed to ksort to alter the way that it sorts the array. The following code will sort an associative array numerically by index.

ksort($ar, SORT_NUMERIC);

Without this option, the index values ’15, 2, 1′ would be sorted ‘1, 15, 2’ and with the SORT_NUMERIC option, the values would be sorted 1, 2, 15.


About Quinn McHenry

Quinn was one of the original co-founders of Tech-Recipes. He is currently crafting iOS applications as a senior developer at Small Planet Digital in Brooklyn, New York.
View more articles by Quinn McHenry

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