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I have an array with keys as date in this format.
$arr = array(
"20110805" => "2",
"20100703" => "5",
"20110413" => "3",
"20100805" => "4",
"20100728" => "6",
"20090416" => "7",
"20080424" => "8",
"20110819" => "1",
);
How can I sort this array by key?
With the dates in that format, an alphabetical comparison will work just fine. Use the PHP function ksort.