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Array ( [0] => Array ( [dateTime] => 2011-10-18 0:0:00 [chanl1] => 20.7 [chanl2] => 45.4 [chanl3] => ) [1] => Array ( [dateTime] => 2011-10-18 0:15:00 [chanl1] => 20.7 [chanl2] => 45.4 [chanl3] => ) [2] => Array ( [dateTime] => 2011-10-18 00:14:00 [chanl1] => 20.7 [chanl2] => 33.8 [chanl3] => ) [3] => Array ( [dateTime] => 2011-10-18 00:29:00 [chanl1] => 20.6 [chanl2] => 33.9 [chanl3] => ) I want to sort the above array based on the [dateTime], the final output should be: Array ( [0] => Array ( [dateTime] => 2011-10-18 0:0:00 [chanl1] => 20.7 [chanl2] => 45.4 [chanl3] => ) [1] => Array ( [dateTime] => 2011-10-18 00:14:00 [chanl1] => 20.7 [chanl2] => 33.8 [chanl3] => ) [2] => Array ( [dateTime] => 2011-10-18 0:15:00 [chanl1] => 20.7 [chanl2] => 45.4 [chanl3] => ) [3] => Array ( [dateTime] => 2011-10-18 00:29:00 [chanl1] => 20.6 [cha
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